Physics check ASAP

1. Copper is wrapped with rubber when used in electric wiring. What describes rubber as a material?
A. Electromagnet
B. Superconductor
C. Conductor
D. Insulator

2. Which material provides resistance to the flow of electrons?
A. Saltwater
B. Salt Crystals
C. Silver
D. Copper

3. A circuit has a resistance of 50.0 ohms. What is the voltage needed to generate a current of 0.02 amps?
A. 100 Volts
B. 0.0004 Volts
C. 1.00 Volt
D. 2,500 Volts

4. What is the effect of doubling the resistance of a circuit on the current in the circuit?
A. The current remains the same.
B. The current is reduced by half.
C. The current is doubled.
D. The current is four times greater.

5. Create a simple series circuit with a 20-volt battery, one 10.0-ohm resistor, and one 15-ohm light bulb. Set the wire resistivity to “tiny” and the battery resistance to 0.0 ohms. What is the current in the circuit?
A. 1.0 A
B. 0.4 A
C. 0.5 A
D. 0.8 A

My Answers:
1. A
2. C
3. A
4. D
5. C

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  1. #1. No way. You must have misread the question
    #2. No way. Silver is one of the best conductors (low resistance)
    #3. Nope. E = IR
    #4. Nope. For a fixed voltage, see #3
    #5. Nope. R = R1+R2 and E=IR

    Are you just guessing?

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    oobleck

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