Electric Circuits

Question 1

What does an open switch do?

Answer 1

prevents flow of current around a circuit

Question 2

What does a voltmeter do?

Answer 2

measure potential difference

Question 3

What is a battery?

Answer 3

multiple cells

Question 4

What is a lamp?

Answer 4

a diode

Question 5

What does a closed switch do?

Answer 5

allows flow of current around a circuit

Question 6

What is a cell?

Answer 6

a part of a battery

Question 7

What does a resistor do?

Answer 7

resists flow of current

Question 8

What does a thermistor do?

Answer 8

changes resistance through temperature

Question 9

What is an LED?

Answer 9

when current flow in one direction, light comes on

Question 10

What does an LDR do?

Answer 10

resistance changes by light conditions

Question 11

What does an ammetor do?

Answer 11

measures current

Question 12

What is a diode?

Answer 12

allows current to flow in only one direction

Question 13

What does a fuse do?

Answer 13

breaks circuit if current gets too high

Question 14

What does a variable resistor do?

Answer 14

changes resistance

Question 15

What do you need to do to draw a circuit?

Answer 15

1. use a ruler
2. use a pencil
3. angles in wires must be 90 degrees

Question 16

What is a charge?

Answer 16

negative charge from electrons

unit: Coulomb (C)

Question 17

What is a current?

Answer 17

flow of charge (electrons)

unit: Amperes (A)

Question 18

What is potential difference (voltage)?

Answer 18

energy supplied to charges (energy collected and delivered by electrons)
unit: Volts (V)

Question 19

What is the equation for charge?

Answer 19

charge = current x time
Q = I x t

Question 20

What is the equation for work done?

Answer 20

work done = potential difference x charge

W = V x Q