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# Electricity and Circuits (Grades 11-12)

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## Electricity and Circuits

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
is the difference in potential energy between the two ends of an electrical circuit.
2.
The electric current in a circuit is drawn to be the direction of travel for                        charges; if electrons are the moving charges in that circuit, then they are moving in the                        direction.
3.
Timmyon connects a resistor across a battery. As the current passes through the battery, is there a voltage gain or a voltage drop? Explain.

4.
What is the relationship explained by Ohm's Law?

5.
When talking about circuits, a string of holiday lights is often used as an example to differentiate between a series or a parallel circuit. You have one string of lights that won't light at all, and the other string is lit with 2 bulbs not working. Which string of lights includes a parallel circuit, and which has a series circuit? How do you know?

6.
Brooke was watching T.V., charging her iPod, heating up her curling iron, and blow-drying her hair. When she plugged in her super-deluxe Austin Mahone singing make-up mirror with extra bright halogen bulbs the power went out and she caught a faint scent of burning rubber. What best explains what happened?
1. Each device she added to the series circuit increased the total resistance. The voltage had to increase to provide current until it became so high it had to shut down.
2. Every device she plugged in acted as a new resistor on a parallel circuit. This increased the resistance to the point that there was not enough voltage to power all the devices.
3. Every device she plugged in acted as a new resistor on a parallel circuit. This would decrease the overall resistance on the parallel circuit and therefore increase the current flowing in the wires. Increasing the current generates more heat in the wire, causing a switch called a "circuit breaker" to open, stopping the flow of current in an attempt to prevent fire.
4. Wizards obviously.
7.
In a                                , some or all of the resistance is cut out of the circuit allowing the voltage to push a huge current through the wires.
1. surge protector
2. circuit breaker
3. blown fuse
4. short circuit
8.
Explain how an electric current is both analogous to and different from plumbing. Be sure to include the generation of energy and the path of flow.

9.
Batteries in a circuit can be set up in two ways, in parallel, or in series combination. You have four 1.5V batteries. Which combination would be better to use in an electrical circuit set-up with a light bulb if you wanted to make the light illuminate as brightly as possible? Explain why.

10.
Complete the diagram below to show a what happens in a short circuit. You must also include a written explanation.

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