Electric Circuits

Category: Electric Circuits

Current & Charge

1 / 15

Which way does current flow in a circuit?

Negative to positive

Positive to negative

Clockwise

Anti-clockwise

2 / 15

Calculate the current in a circuit when the charge is 24 C over 6 seconds.

2 A

4 A

6 A

8 A

3 / 15

A smart phone has a charge flowing through it of 2 mC every 5 s. Calculate the current.

0.4 A

0.01 A

4x10^-3 A

1x10^-3 A

4 / 15

The unit for charge is Coulombs, what is this in SI base units?

A s^-1

A s

A s²

5 / 15

Calculate the the time taken for a current of 5.2 mA to reach a charge of 25 C.

0.13 seconds

4.8 seconds

2 minutes 10 seconds

80 minutes 8 seconds

6 / 15

Calculate the charge of 2.7 A current flowing for 3 minutes.

8.10 C

66.7 C

143 C

486 C

7 / 15

The charge on an electron is 1.60x10^-19 C. Calculate how many electrons are needed to create a charge of 4.2 C.

1.42x10^-19

2.84x10^-19

2.63x10¹⁹

5.25x10¹⁹

8 / 15

A battery delivers 5.2 x10³ C of electric charge to a circuit in 12 minutes. Calculate the current.

0.14 A

7.22 A

3.74x10⁶ A

9 / 15

Which piece of equipment can be used to measure the current in a circuit?

Ammeter

Voltmeter

Oscilloscope

Newton Meter

10 / 15

How should you connect a current measuring piece of equipment in a circuit?

It doesn't need connected to the circuit.

In parallel to the battery.

In parallel to the component you want to know the current through.

In series.

11 / 15

The current in a circuit depends on the mean drift velocity of the charge carriers. This can be defined by this equation, what is the current if the number of charge carriers doubles?

I/2

I²

12 / 15

The current in a circuit depends on the mean drift velocity of the charge carriers. This can be defined by this equation, what is the current if the mean drift velocity of charge carriers halves?

I/2

I²

13 / 15

The current in a circuit depends on the mean drift velocity of the charge carriers. This can be defined by this equation, what is the current if the cross sectional area of the material doubles?

I/2

I²

14 / 15

What would be the n value of a perfect insulator?

Very small

15 / 15

Silver has 7.9x10²⁸ free electrons per m³. Calculate the mean drift velocity of the electrons in a piece of silver wire that has a cross-sectional area of 3.2x10^-3 m² when a current of 13A is flowing.

5.26x10^-8 ms^-1

3.21x10^-7 ms^-1

4.04x10⁷ ms^-1

5.26x10⁸ ms^-1

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Potential Difference

1 / 10

Potential difference is...

The current per second of a closed circuit.

The work done per unit charge moved.

The amount of charge passing a point in a closed circuit per second.

The difference in unit charge either side of a battery.

2 / 10

Which piece of equipment can be used to measure the potential difference in a circuit?

Ammeter

Voltmeter

Luxmeter

Newton Meter

3 / 10

How should you connect a potential difference measuring piece of equipment in a circuit?

It doesn't need connecting to the circuit.

In parallel to the battery.

In parallel to the component you want to know the potential difference over.

In series.

4 / 10

Calculate the potential difference of a battery that has 230 J of energy and moves 120 C of charge.

0.52 V

1.92 V

2.76 V

27600 V

5 / 10

Calculate the charge moved in a circuit that has a 12 V power supply and moves 1.4x10⁶ J of energy.

8.57x10^-6 C

1.68x10^-5 C

1.17x10⁵ C

1.68x10⁷ C

6 / 10

A head torch used on a D of E expedition is rated at 3W with a 3.7 V battery, how many electrons pass through in the 5 minutes it takes for a return trip to campsite bathroom at night?

5.07x10¹⁸ electrons

1.30x10¹⁹ electrons

3.04x10²⁰ electrons

1.52x10²¹ electrons

7 / 10

A microwave runs off the mains in the U.K. and has an efficiency of 98%. Calculate how much electric charge will pass through the microwave per second if it transfers 1.31kJ of energy.

5.58 C

5.70 C

5.81 C

5.94 C

8 / 10

In this diagram, what should the potential difference of the missing value be?

2 V

4 V

8 V

0 V

9 / 10

In this diagram, what should the potential difference of the cell be?

0 V

3.6 V

6 V

8.4 V

10 / 10

The unit for potential difference is Voltage, what is this in SI base units?

m² kg s^-3 A^-1

A s

J s^-1 A^-1

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Resistance & Resistivity

1 / 10

A resistor in a circuit has a current through it of 0.20 A when the potential difference across it is 15 V. Calculate the resistance of the resistor.

0.013 Ω

3 Ω

75 Ω

130 Ω

2 / 10

A 50 Ω resistor in an electric circuit has a potential difference across it of 20 V. Calculate the current through the resistor.

0.4 A

1 A

2.5 A

1 kA

3 / 10

Which of these circuit symbols represents a thermistor?

4 / 10

If the area (A) of a material was to doubled, what would the resistance be?

R/2

R²

5 / 10

If the area (A) of a material was to doubled, what would the resistance be?

R/2

R²

6 / 10

Which graph best describes Ohm's law?

7 / 10

Which of the following options is the unit for resistivity?

Ωm

Ω²

Ωm²

8 / 10

The unit for resistance is Ohms, what is this in SI base units?

kg s^-2 A^-1

m^-2 kg^-1 s⁴ A²

m² kg s^-3 A^-1

m² kg s^-3 A^-2

9 / 10

Copper has a resistivity of 1.724x10^-8 Ω m at 20 °C. Calculate the resistance of a piece of copper wire that measures 40 cm long and has a diameter of 0.8 mm.

0.0034 Ω

0.0137 Ω

0.343 Ω

1.372 Ω

10 / 10

Connell's chain is made from silver which has a resistivity of 1.59 x10^-7 Ω m at 20 °C. It has a diameter of 4mm and a resistance of 0.71 Ω. What is the area inside the entire necklace when shaped in a perfect circle?

182 cm²

250 cm²

254 cm²

267 cm²

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I-V Characteristics

1 / 10

Select the missing word: "The shallower the gradient of a I-V characteristic graph, the ____________ the resistance of the conductor.

Smaller

Larger

Weaker

2 / 10

Which graph best represents the I-V characteristic graph of a filament lamp?

3 / 10

Which graph best represents the I-V characteristic graph of a metallic conductor at a constant temperature?

4 / 10

Which graph best represents the I-V characteristic graph of a diode?

5 / 10

Which graph best represents the I-V characteristic graph of a NTC thermistor?

6 / 10

Select the missing word: "The more charge carries available, the greater the current therefore the resistance ___________.

Increases

Decreases

Stays the same

Remains at zero

7 / 10

Which graph best represents the resistance of an NTC thermistor?

8 / 10

Which graph best represents the resistance of an NTC thermistor?

9 / 10

Which of these circuit symbols represents a thermistor?

10 / 10

Which of these circuit symbols represents an LDR?

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Electrical Energy and Power

1 / 10

Your phone charger supplies a current of 2.1 A and has a power rating of 6 W. What is the potential difference?

0.35 V

1.26 V

2.86 V

12.6 V

2 / 10

Which of these expressions is not a correct expression for calculating the electrical power of a circuit?

Expression A

Expression B

Expression C

Expression D

3 / 10

A light bulb of resistance 600 Ω is powered by a 230 V supply. Calculate the power rating of the bulb.

0.4 W

2.6 W

88.2 W

600.0 W

4 / 10

The unit for power is the Watt, what is this in SI base units?

m²kgs^-2

m²kgs^-3

m kg s²

Js^-1

5 / 10

Laura Kenny can reach 1070 W cycling on her bike. If she was a 12 V battery, what would her current be?

0.01 A

12 A

89 A

1284 A

6 / 10

When the LHC is full operational in the summer months, it accounts for 115 MW of CERN's 200 MW requirements. Calculate the total energy transferred over 28 days for the LHC.

2.78x10¹⁴ J

3.81x10¹⁴ J

4.84x10¹⁴ J

7.62x10¹⁴ J

7 / 10

Which of these expressions is not a correct expression for calculating the electrical power of a circuit?

Expression A

Expression B

Expression C

Expression D

8 / 10

A 75 watt light bulb is left ON for 24 hours, calculate the total energy transferred.

1800 J

1.08 x10⁵ J

6.48x10⁶ J

3.89x10⁸ J

9 / 10

The unit for energy is the Joule, what is this in SI base units?

m²kg s^-2

m²kg s^-3

m kg s²

Js^-1

10 / 10

An electric motor is used to raise a load. When the switch is closed, the ammeter reads 94 mA and the motor raises a 568 g load through a height of 174 cm in 25 seconds. Calculate the potential difference of the circuit assuming it is 100% efficient. g = 9.81 N kg⁻¹

9.7 V

36.8 V

103.1 V

109.7 V

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E.M.F and Internal Resistance

1 / 10

The electromotive force, or e.m.f. (Ɛ), is measured in which unit?

Joules

Volts

Newtons

Coulombs

2 / 10

A 12 Ω and a 10 Ω resistor are connected in series with a battery of e.m.f. 6 V and internal resistance 2 Ω. Calculate the potential difference over the battery.

0.25 V

2.5 V

5.5 V

8.5 V

3 / 10

A battery of e.m.f. 7 V is connected across a 42 Ω resistor. If the potential difference across the resistor is 6 V, calculate the internal resistance of the cell.

6 A

7 A

8 A

9 A

4 / 10

Which of these expressions is not a correct expression for calculating Ɛ?

Expression A

Expression B

Expression C

Expression D

5 / 10

What is Ɛ measured in terms of SI base units?

m² kg s^-3 A^-1

m² kg s^-2

J s^-1 A^-1

m^-1 kg s^-2

6 / 10

A battery of e.m.f. 1.5 V with an internal resistance of 0.5 Ω is connected in series to a 5 Ω resistor. Calculate the current in the circuit.

0.12 A

0.25 A

0.4 A

3.6 A

7 / 10

Plotting a graph of V against I, what is the gradient equal to?

-r

-Ɛ

8 / 10

A cell of e.m.f. 3.0 V and internal resistance 0.3 Ω is connected in a series with an ammeter reading 0.25 A and a motorised hula girl who dances when the circuit is complete. Calculate the power supplied by the cell.

0.71 W

0.73 W

0.75 W

0.77 W

9 / 10

A battery with internal resistance 0.4 Ω and an e.m.f. of 15 V powers a portable speaker with a resistance of 9 Ω. Calculate the voltage across the speaker when it is being used.

13.4 V

14.4 V

15.3 V

15.9 V

10 / 10

A battery of e.m.f. E, with an internal resistance, r, was connected in series with a variable resistor, R and an ammeter. Looking at the readings from the above table, calculate the e.m.f. of the battery.

0.4 V

3.6 V

4.0 V

4.5 V

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Conservation of Charge in Circuits

1 / 10

The current at A₁ is 4 A and the current at A₂ is 1 A. Select the current at A₄.

1 A

2 A

3 A

4 A

2 / 10

The current at A₁ is 4 A and the current at A₂ is 1 A. Select the current at A₃.

1 A

2 A

3 A

4 A

3 / 10

Calculate the total resistance of the circuit shown.

0.69 Ω

4 Ω

8 Ω

16 Ω

4 / 10

Calculate the total resistance of the circuit shown.

0.62 Ω

1.6 Ω

5 Ω

15 Ω

5 / 10

Calculate the current at A₁ in the circuit shown.

0.13 A

1.37 A

2.05 A

2.93 A

6 / 10

Calculate the current at A₂ in the circuit shown.

0.13 A

0.75 A

1.5 A

2.5 A

7 / 10

Calculate the current at A₃ in the circuit shown.

0.55 A

1.37 A

1.43 A

1.5 A

8 / 10

Calculate the current at A₁ in the circuit shown.

0.21 A

0.51 A

0.79 A

1.37 A

9 / 10

Calculate the current at A₂ in the circuit shown.

0.15 A

0.21 A

0.36 A

0.51 A

10 / 10

Calculate the potential difference at V₁ in the circuit shown.

4.36 V

7.65 V

8.72 V

12 V

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Potential Dividers

1 / 15

Select the correct potential divider equation.

2 / 15

Select the effect on V_out when the light intensity decreases on this circuit.

V_out increases.

V_out decreases.

V_out remains constant.

3 / 15

Select the effect on V_out when the surrounding temperature increases for circuit.

V_out increases.

V_out decreases.

V_out remains constant.

4 / 15

Select effect on V_out when the light intensity increases on this circuit.

V_out increases.

V_out decreases.

V_out remains constant.

5 / 15

Select the effect on V_out when the surrounding temperature decreases for circuit

V_out increases.

V_out decreases.

V_out remains constant.

6 / 15

Select the effect on V_out when the surrounding temperature decreases for circuit.

V_out increases.

V_out decreases.

V_out remains constant.

7 / 15

Select the effect on V_out when the light intensity decreases on this circuit.

V_out increases.

V_out decreases.

V_out remains constant.

8 / 15

Select the effect on V_out when the surrounding temperature increases for circuit.

V_out increases.

V_out decreases.

V_out remains constant.

9 / 15

Select effect on V_out when the light intensity increases on this circuit.

V_out increases.

V_out decreases.

V_out remains constant.

10 / 15

Select effect on V_out when the light intensity increases on this circuit.

V_out increases.

V_out decreases.

V_out remains constant.

11 / 15

Select the effect on V_out when the surrounding temperature decreases for circuit.

V_out increases.

V_out decreases.

V_out remains constant.

12 / 15

Select a use for this circuit in fluctuating light conditions. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

13 / 15

Select a use for this circuit when the temperature fluctuates. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

14 / 15

Select a use for this circuit when the temperature fluctuates. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

15 / 15

Select a use for this circuit in fluctuating light conditions. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

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Alternative Electric Units

1 / 10

The unit of resistance is the ohm. A correct alternative unit is:

WA²

WA^-1

WA^-2

2 / 10

The unit of potential difference is the volt. A correct alternative unit is:

JA^-1t^-1

JAt

J^-1At

JAt^-1

3 / 10

The unit of current is the ampere. A correct alternative unit is:

VΩ

VΩ^-1

V^-1Ω^-1

ΩV^-1

4 / 10

The unit of current is the ampere. A correct alternative unit is:

JΩC^-1

J^-1ΩC

JΩ^-1C^-1

JΩ^-1C

5 / 10

The unit of resistance is the ohm. A correct alternative unit is:

VW^-2

WV^-2

V²W^-2

V²W^-1

6 / 10

The unit of power is the watt. A correct alternative unit is:

VsC^-1

CV^-1S^-1

VCs^-1

VCs

7 / 10

The unit of potential difference is the volt. A correct alternative unit is:

CΩ^-1s^-1

ΩC^-1s^-1

CΩs

CΩs^-1

8 / 10

The unit of power is the watt. A correct alternative unit is:

VCs^-1

Ω²V^-2

V²Ω

V²Ω^-2

9 / 10

The unit of resistivity is the ohm-metre. A correct alternative unit is:

AmV^-1

VmA^-1

VAm^-1

Am^-1V^-1

10 / 10

The unit of charge is the coulomb. A correct alternative unit is:

JAΩ

JA^-1Ω^-1

JAΩ^-1

JA^-1Ω

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Your score is

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