19.2 Using Electrical Energy

19.2 Using Electrical Energy

😉

Learning check point 1

Power Equations 😄

Multiple Choice

A heater has a resistance of 10 ohms. It operates on 120.0 V.

a) What is the power of the heater?

• 902 W

• 1440 W

Multiple Choice

b) Great! So we found P = 1440 W. Can you now Find what thermal energy is supplied by the heater in 10 s?

• 14400 J

• 9000 J

Learning check point 2

Electrical Energy😊

Multiple Choice

What happens if we increase resistance in a wire?

• Temperature increases because electrons bump into atoms

• Temperature decreases because electrons bump into atoms

Multiple Choice

What is a superconductor?

• a material with resistance

• a material with no resistance

Multiple Choice

An electric space heater draws in 15.0 A from a 120 V source. It is operated, on average for 5.0 h each day.

a) How much power does the heater use?

• 2.9 kW

• 1.8 kW

Open Ended

Any questions?

Bye bye Semester 2

We got this!