Electrical Power

A toaster produces 55 W of power and draws a current of 10 A. What voltage must be applied to run the toaster?

The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery. What is the current in the battery?

• 0.50A

• 0.75A

• 1.50A

• 2.00A

40 lamps, each of resistance 8 are connected in series with a 240 V supply, in order to decorate a tree. The current in each lamp is

• 2.0 A

• 0.75 A

• 1.0 A

• 1.33 A

What is the final voltage level that a pole-mounted transformer steps down to in a typical power distribution system?

• 240 volts

• 120 volts

• 480 volts

• 60 volts

What is the voltage difference between the two hot wires in a 240-volt circuit?

• 120 volts

• 180 volts

• 240 volts

• 360 volts

What is the purpose of an insulator in an electrical system?

• To allow the flow of electric current

• To prevent the flow of electric current

• To increase the voltage in a circuit

• To provide a return path to complete a circuit

How is electrical power calculated?

• Voltage X Current

• I X V

• Potential Difference X Current

• V divided by I

A kettle has a power rating of 2kW, if it's left on for 6 hours, how many units of electricity does it use?

• 10

• 3

• 12

• 24

Tags

NGSS.HS-PS3-1

A tv has a power rating of 5kW, if it's left on for 4 hours every day for a weekend, how many units of electricity does it use?

• 40

• 4

• 12

• 120

A radio has a power rating of 2kW, if it's left on for 5 hours, and each unit of electricity costs 10cents, how much is the cost?

• 1 euro

• 2 euro

• 10 euro

• 2.50 euro