Vash Education: Electricity Calculations

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1. What is the unit of Charge?

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Ampere

Volt

Coulomb

Time/change in velocity

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2. Calculate the amount of charge passing a point at 3.0A current, for 5 minutes.

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15 C

270 C

900 C

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3. What is the formula relating voltage, energy and charge.

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E= V/Q

EV=Q

EQ=V

V=E/Q

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4. An electric motor of a model car is powered by a 1.5V battery.

If 120 C of charge passes through the motor circuit in the moving car, how much energy is transferred?

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18 J

270 J

180 J

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5. A 12.0 V battery passes a current of 2.0 A through a lamp for 5 minutes.

Calculate how much charge passed through the lamp.

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60 C

600 A

600 C

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6. Which one of the following formula represent Ohm's law?

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V= I/R

V =IR

RV=I

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7. Calculate the amount of current passing through a resistor, if the voltage supplied is 9 V and the amount of resistance is 12 Ohms.

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0.2 A

0.3 A

0.25 A

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8. A motor was supplied with 12 V and works for 15 minutes. The current was 3 A.

Calculate the energy produced by the motor during this period.

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3200 J

32000 E

32000 J

3.2 KJ

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9. A kettle has a power rating of 180 kW. When connected to the mains supply, it has a potential difference of 300 V.

Calculate the current.

Do not include units in your answer.

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10. 300 J of energy are transferred in 3 minutes.

Calculate the power.

Give your answer to 3 significant figures and do not include units.

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