Electrical Working

Multiple Choice

Which one of the following quantities is equivalent to 1 W?

• 1 V/A

• 1 Ω • m

• 1 V • A

• 1 V/Ω

Multiple Choice

A kilowatt-hour is equivalent to

• 1000 W.

• 3600 J.

• 3,600,000 J/s.

• 3,600,000 J.

Multiple Choice

kWh stand for

• kilowestohm

• kilometwer

• kilowatt hour

Multiple Choice

The current in an appliance is 3 A and the voltage difference is 120 V. How much power is being supplied to the appliance?

• 10000 v

• 220 v

• 420 v

• 360 v

Multiple Choice

If it takes 10 J of work to climb up the stairs in 5 seconds

• 2 W

• 5 W

• 150 W

• 200 W

Multiple Choice

What is the power of a 20V bulb with 5A through it?

• 100W

• 100V

• 6.3W

• 6.3A

Multiple Select

What are the Equations for Energy Transferred? Choose 2

• Energy Transferred = Power x Time

• Energy Transferred = Power / Time

• Energy Transferred = Charge Flow x Potential Difference

• Energy Transferred = Charge Flow / Potential Difference

Multiple Choice

How much energy is transferred if a 40W bulb is left on for 2 hours?

• 80 J

• 4800 J

• 240 J

• 288 000J

Multiple Choice

A 240 volt, 3 amp heater is left running for 5 minutes.

Which of these gives the total energy output?

• 3.6 kJ

• 216 kJ

• 72 kJ

• 0.9 kJ

Multiple Choice

The power of an appliance is...

• the amount of energy transferred per second

• the amount of voltage going through it

• the amount of charge that passes through per second

• None

Multiple Choice

Electrical power can be calculated using

• Resistance x Voltage

• Voltage x Current

• Voltage ÷ Current

• Voltage + Current

Multiple Choice

Watts is the same as...

• Voltage per second

• Current per second

• Joules per second

• all of these

Multiple Choice

The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?

• 170 A

• 170 W

• 170 ohm

• 1.7 W

Multiple Choice

Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.

• 80 W

• 200 W

• 2.5 A

• 22.5 k W

Multiple Choice

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

• bulb

• resistor

• diode

• LDR

Multiple Choice

Which component has the following characteristic graph - showing how the current varies as the voltage is changed?

• bulb

• fuse

• resistor

• diode