P4 (Electric Circuits)

Question 1

What is a cell?

Answer 1

Pushes the electrons

Question 2

What is a switch?

Answer 2

Enables you to break and complete a circuit

Question 3

What is a bulb?

Answer 3

Emits light when current flows through it

Question 4

What is a fixed resistor?

Answer 4

Limits the current in a circuit

Question 5

What is a variable resisitor?

Answer 5

Allows the current in a circuit to be varied

Question 6

What is a thermistor?

Answer 6

Allows the current depending on the temperature

Question 7

What is a fuse?

Answer 7

Is designed to melt and break the circuit if the current is too great

Question 8

What is a diode?

Answer 8

Allows the current through in only one direction

Question 9

What is a light emitting diode (LED)?

Answer 9

Emits light when current passes through it

Question 10

What is a light-dependent resistor (LDR)?

Answer 10

Decreases in resistance as light intensity increases

Question 11

What is an ammeter?

Answer 11

Used to measure electric current

Question 12

What is a voltmeter?

Answer 12

Used to measure electric potential difference

Question 13

Ohm’s Law

Answer 13

The current through a conductor (at constant temperature) is directly proportional to the voltage across two points