Calculating Power in Electrical Circuits

What is power a measure of?

• The total energy used

• The amount of energy stored

• The speed at which energy is transferred

• The voltage of an appliance

Tags

NGSS.MS-PS3-5

Which light bulb transfers more electrical energy each second?

• It depends on the voltage

• Both transfer the same amount

• A 100 watt light bulb

• A 60 watt light bulb

How do you calculate power using energy and time?

• Power = Energy transferred in Joules * Time in seconds

• Power = Energy transferred in Joules / Time in seconds

• Power = Energy transferred in Joules + Time in seconds

• Power = Energy transferred in Joules - Time in seconds

If an electric lamp transfers 500 Joules in 5 seconds, what is its power?

• 500 watts

• 5 watts

• 100 watts

• 50 watts

How can you calculate the power of an electrical appliance using current and potential difference?

• Divide the current in amps by the potential difference in volts

• Multiply the current in amps by the potential difference in volts

• Add the current in amps to the potential difference in volts

• Subtract the current in amps from the potential difference in volts

What role do fuses play in electrical appliances?

• They increase the power of the appliance

• They prevent the appliance from overheating

• They store electrical energy

• They convert electrical energy to heat

What is the best fuse to use for a 1.15 kilowatt electric fire with a voltage of 230 volts?

• 15 amp

• 13 amp

• 3 amp

• 5 amp

What is the standard rating for fuses?

• 1 amp, 2 amps, and 3 amps

• 3 amps, 5 amps, and 13 amps

• 10 amps, 20 amps, and 30 amps

• 15 amps, 25 amps, and 35 amps