Electricity Power

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

• 1 V/A

• 1 Ω • m

• 1 V • A

• 1 V/Ω

A kilowatt-hour is equivalent to

• 1000 W.

• 3600 J.

• 3,600,000 J/s.

• 3,600,000 J.

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

Tags

NGSS.HS-PS2-5

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

When 5.00 A is flowing through an 10.0-Ω device, how much power is being dissipated in the device?

• 50.0 W

• 250 W

• 500 W

• 2.50 kW

What is the resistance of a 0.100-kW light bulb designed to be used in a 120-V circuit dc?

• 12.0 Ω

• 144 Ω

• 1.2 Ω

• 0.83 Ω