Power in Circuits

What supplies the energy in a circuit?

• bulb
• battery
• wires
• buzzer

What is the unit of Electrical Power?

• Joule

• Watt

• Where

• Amp

Tags

NGSS.HS-PS2-5

A heater has an internal resistance of 16 ohms is placed on a 120 V circuit. What is the power?

• 900 watts

• 1920 watts

• 7.5 watts

• 18 watts

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

Calculate the power generated as a 20 A current flows through a 10Ω resistor?

• 2 W

• 200 W

• 4000 W

• 400 W

Tags

NGSS.HS-PS3-1

Calculate the electric power of an appliance of 20 V having a resistance of 10 ohms.

• 200 W

• 40 W

• 2.5 A

• 79.20 KJ

The brightness of a lightbulb is most closely related to

• its resistance.

• the voltage drop across it.

• the current through it.

• the power dissipated by it.

What voltage must be supplied if a 3 ohm resistor dissipates 300 watts?

• 100 V

• 900 V

• 30 V

• 10 V

Doubling the voltage of a circuit will cause to power dissipated by the circuit to be multiplied by

• 2

• 4

• 1/2

• 1/4

Doubling the resistance of a circuit will cause the power dissipated by the circuit to be multiplied by

• 2

• 4

• 1/2

• 1/4