U3.5 – Electrical Energy & Power

2

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?

2 / 10

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

3 / 10

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

4 / 10

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

5 / 10

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

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.

7 / 10

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

8 / 10

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

9 / 10

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

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

 

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