Electricity and Magnetism Flashcards

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Flashcards for Electricity and Magnetism Review

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33 Terms

1
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What are sources of resistance in a circuit?

Wire length, wire area, wire density

2
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What type of wire would have high resistance? Consider length and width.

Long, thin wire

3
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What is the role of the battery?

Energy source

4
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What is the difference between a conductor and an insulator? Give examples.

Conductor allows flow of electrons, insulator does not.

5
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What is the difference between DC and AC current?

Direct and alternating

6
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What are two ways to accidentally de-magnetize an object?

Drop it, heat it

7
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Draw the magnetic field around a bar magnet.

Field lines extend from N pole and wrap into S pole.

8
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What poles attract? Repel?

Like poles repel, opposites attract

9
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How does distance & magnetic strength affect the strength of a magnetic force?

Force weakens with distance

10
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What is an electromagnet?

Wire with current running through it, wrapped around an iron core

11
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What can you do to increase the strength of an electromagnet (there are multiple ways)?

More voltage, more coils, shorter wire

12
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Why does moving a magnet through a coil of wire generate a current? Think about what the electrons are doing.

The moving magnet pushes the electrons through the wire

13
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What are 5 real life applications of electromagnets?

Medical field, junk yard

14
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Compare the # of protons and electrons in a positive object

P > e

15
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16
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Compare the # of protons and electrons in a negative object

P < e

17
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18
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Compare the # of protons and electrons in a neutral object

P = e

19
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What types of charges attract? Repel?

Opposites attract, like charges repel

20
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What happens to the electric force if Q1 doubles?

F doubles

21
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What happens to the electric force if Q1 and Q2 double?

F x 4

22
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What happens to the electric force if Q2 is halved?

F is halved

23
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What happens to the electric force if Distance doubles?

F = 1/4

24
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What happens to the electric force if Distance triples?

F = 1/9

25
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What happens to the electric force if Distance halves?

F x 4

26
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What are the two general set ups for circuits? Be able to identify.

Series & parallel

27
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What is the advantage of a parallel circuit?

Turn off one light the others

28
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Describe the 3 ways an object can obtain a charge.

Friction, contact, induction

29
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What is the only charging method that does not require objects to touch?

Induction

30
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Charge can be lost through static discharge. Explain what this is and draw an example.

You are negatively charged + you touch a metal object, charges rush out of you and onto the metal object

31
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What types of materials/elements make good magnets?

Iron, Nickel, Cobalt

32
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What are magnetic domains?

Areas where the electrons are aligned

33
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Write out Ohm's Law and the appropriate units for each variable.

V = IR ; Voltage (volts), Current (Amps), Resistance (Ohms)