U3.3 – Resistance & Resistivity

1

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.

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.

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?

5 / 10

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

6 / 10

Which graph best describes Ohm's law?

7 / 10

Which of the following options is the unit for resistivity?

8 / 10

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

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.

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?

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