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# Henderson's Physics 163

### Chapter 22 Opening Questions

This page last modified on 2/8/08.

Monday, February 4:

Identify the following statements as being either True or False:

1. When a battery no longer works, it is out of charge and must be re-charged before it can be used again.

2. A battery can be a source of charge in a circuit. The charge which flows through the circuit originates in the battery.

3. Charge becomes used up as it flows through a circuit. The amount of charge which exits a light bulb is less than the amount which enters the light bulb.

4. Charge flows through circuits at very high speeds. That is why the light bulb turns on immediately after the wall switch is flipped.

5. Commonwealth Edison supplies millions and millions of electrons to our homes everyday.

Tuesday, February 5:

Consider the diagrams below. In which case will the light bulb NOT light? For each non-lighitng situation, explain why the light bulb will not light.

Thursday, February 7:

The following circuit consist of a power supply, an ammeter (for measuring current), and a light bulb. Use >, <, and = symbols to compare the electric potential at A to B and at C to D. Indicate whether the devices add energy to or remove energy from the charge. Finally, fill in all blanks.

 VA ____ VB (>, <, or =) VC ____ VD (>, <, or =) VB ____ VD (>, <, or =)

Friday, February 8:

Consider the circuit below. Determine the ammeter readings, the voltmeter reading and the power rating of the light bulb.

Tuesday, February 12:

From the textbook: page 613, #89

If a person has \$5, then how long could he or she play a 200-watt stereo if electricity costs \$0.15 /kW•hr?

Wednesday, February 13:

A 60-watt and a 100-watt light bulb are present in a 120-volt circuit. Calculate the current in and the resistance of the two light bulbs. Organize your calculations.

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