Electric Power Problems

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

• 1 V/A

• 1 Ω • m

• 1 V • A

• 1 V/Ω

A 200-W light bulb is connected across a 100-V dc power supply. What current will flow through this bulb?

• 0.90 A

• 0.36 A

• 0.60 A

• 2.0 A

A light bulb operating at a dc voltage of 100 V has a resistance of 200 Ω. How much power is dissipated in this bulb?

• 100 W

• 60 W

• 50 W

• 200 W

What is the unit of Electrical Power?

• Joule

• Watt

• Where

• Amp

A kilowatt (kW) is how many watts?

• 10

• 50

• 100

• 1000

The unit of energy is?

• Amp

• Joule

• kiloWatt

• Volt

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

• 300 volts

• 30 volts

• 12 volts

• 0.08 volts

The power of an appliance is...

• the amount of voltage going through it 
• the amount of energy transferred per second
• the amount of charge that passes through per second

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

• 170 W
• 170 A
• 1.7 V
• 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.
 
Remember: V=IR and P=VI

• 80 W
• 200 W
• 2.5 A
• 22.5 KJ