Fun Quiz - End of Chapter 5

Fun Quiz - End of Chapter 5

Multiple Choice

Which of the following substances best conducts electricity?

• Copper

• Plastic

• water

• Nichrome

Multiple Choice

If each of the following were used as the core of an electromagnet, which would have the least effect on the strength of the magnetic field?

• An iron nail

• A cobalt rod

• A glass test tube

• A nickel screwdriver

Multiple Choice

Which of the following electromagnets produces the strongest magnetic field?

Multiple Choice

If you are making an electromagnet, which combination will produce the strongest magnetic field?

1. A solenoid with 100 turns

2. A solenoid with 200 turns

3. A current of 5 amperes

4. A current of 10 amperes

• 1 and 3

• 2 and 3

• 1 and 4

• 2 and 4

Multiple Choice

David dried the family's laundry in an electric clothes dryer. The rating plate on the dryer gives the following information :

240 V, 60 Hz, 5000 W

David used the dryer for 4 hours. The average rate of electricity is $ 0.04 per kWh.

How much did it cost him to dry the clothes?

• $0.16

• $0.20

• $0.80

• $0.92

Multiple Choice

The four diagrams represent electromagnets connected to the terminals of a battery.

In which diagrams are the magnetic poles of the electromagnet correctly indicated?

• 1 and 3

• 1 and 4

• 2 and 4

• 3 and 4

Multiple Choice

Magnetic lines of force are shown in the diagrams.

Which of the diagrams is INCORRECT?

• I

• II

• III

• IV

Open Ended

A stereo has a power rating of 500W & is used for 1hr. How much energy was consumed?

Please give your answer in joules and kWh.

Open Ended

Your table lamp is plugged in at the wall. It uses 110V and 0.545A to run. Over the course of the month you have used it for 98 hours (about 3 hours a night).

How many kWh have you contributed to your home’s hydro bill?

Open Ended

A microwave oven carries the following label :

Voltage : 115 Volts

Current : 4.5 A

A conventional oven carries the following label :

Voltage : 230 Volts

Current : 20 A

The conventional oven uses electrical power for 80% of the time that it is switched on, whereas the microwave uses electric power all the time.

To cook a particular dish requires 23 minutes using the microwave oven and 38 minutes in the conventional oven.

How much energy is saved using the microwave oven?