Electrical circuit symbols

Question 1

What is a cell?

Answer 1

a Source of electrical energy

Question 2

What is a battery?

Answer 2

2 or more cells joins together

Question 3

What is a lamp?

Answer 3

An output device;
Changes electrical
energy into light

Question 4

What is a switch?

Answer 4

An input device;

Used to make a complete circuit

Question 5

What is a resistor?

Answer 5

It limits the amount of current in a circuit. Can’t be changed

Question 6

What is a variable resistor?

Answer 6

It limits the amount of current in a circuit. Can be changed

Question 7

What is an LED?

light-emitting diode

Answer 7

An output device;

Changes electrical energy into light. Uses less current than lamp

Question 8

What is a motor?

Answer 8

An output device;
Changes electrical energy into
Kinetic energy

Question 9

What is a loudspeaker?

Answer 9

An output device;
Changes electrical energy into
sound energy

Question 10

What is a photovoltaic cell?

also known as a solar cell

Answer 10

Changes light energy into

Electrical energy

Question 11

What is a fuse?

Answer 11

Melts if the current is too high protecting the circuit

Question 12

What is a diode?

Answer 12

It allows current to flow in one direction only

Question 13

What is a capacitor?

Answer 13

It stores charge

Question 14

What is a thermistor?

Answer 14

The higher the temperature the smaller the resistance

Question 15

What is an LDR?

light dependent resistor

Answer 15

?

Question 16

What is a NPN transistor?

Answer 16

?

Question 17

What is a

N-channel MOSFET transistor?

Answer 17

?

Question 18

What is a microphone?

Answer 18

An input device;
Changes sound into
electrical energy

Question 19

What is a relay?

Answer 19

A magnetic switch used to turn on high voltage secondary circuits