ELECTRICAL ENERGY & POWER

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

Electrical power can be calculated using

• Resistance x Voltage

• Voltage x Current

• Voltage ÷ Current

• Voltage + Current

Watts is the same as...

• Voltage per second

• Current per second

• Joules per second

• all of these

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

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

A pair of 15-watt computer speakers are connected to a 12-volt power supply. what is the electric current running through the speakers?

• 1.25 A

• 0.8 A

• 12.5 A

• 180 A

If an oven has a power of 2000 W and the voltage is 230 V what current rating of fuse is required?

• 3 .5 A

• 5 .7 A

• 8.7 A

• 20.4 A