Electricity Revision

Question 1

What is the circuit symbol for a light bulb/lamp?

Answer 1

Question 2

What is the circuit symbol for a battery?

Answer 2

Question 3

What is the circuit symbol for a cell?

Answer 3

Question 4

What is the circuit symbol for a resistor?

Answer 4

Question 5

What is the circuit symbol for a motor?

Answer 5

Question 6

What is the circuit symbol for a voltmeter?

Answer 6

Question 7

What is the circuit symbol for an ammeter?

Answer 7

Question 8

What is used to measure voltage?

Answer 8

A voltmeter

Question 9

What is used to measure current?

Answer 9

An ammeter

Question 10

What is resistance measured in?

Answer 10

Ohms

Question 11

What is voltage measured in?

Answer 11

Volts (V)

Question 12

What is current measure in?

Answer 12

Amps

Question 13

What is the circuit symbol for a LDR (Light dependent resistor)?

Answer 13

Question 14

What is the circuit symbol for an LED (Light emitting diode)?

Answer 14

Question 15

What is the circuit symbol for a thermistor?

Answer 15

Question 16

How does a thermistor work?

Answer 16

As the temperature goes up the resistance goes down (TURD)

or as the temperature decreases the resistance increases

Question 17

How does an LDR work?

Answer 17

As the light level increases the resistance decreases (LURD) or as the brightness increases the resistance decreases (BURD).

Alternatively as the light level decreases the resistance will increase

Question 18

What is the energy change for a motor?

Answer 18

Electrical to sound/kinetic/heat

Question 19

What is the energy change for a loudspeaker?

Answer 19

electrical to sound

Question 20

What is the energy change for a solar cell?

Answer 20

light to electrical

Question 21

What is the energy change for a microphone?

Answer 21

sound to electrical

Question 22

What is an input device?

Answer 22

A device that changes some form of energy into electrical energy

Question 23

What is an output device?

Answer 23

A device that changes electrical energy into another form of energy

Question 24

What are the process devices called?

Answer 24

Logic gates

AND, OR and NOT

Question 25

What is a truth table?

Answer 25

A table with all the possible input and outputs for a system

Question 26

What is the truth table for a NOT gate?

Answer 26

Question 27

What is the truth table for an AND gate?

Answer 27

Question 28

What is the truth table for an OR gate?

Answer 28

Question 29

What is the difference between a series and a parallel circuit?

Answer 29

A series circuit consists of one loop whereas a parallel circuit is made up of two or more loops.

Question 30

What is ohm's law?

Answer 30

V = I x R Voltage = Current x Resistance

Question 31

What does it mean if a component is ohmic?

Answer 31

It follows ohms law

Question 32

What does it mean if a component is non-ohmic?

Answer 32

It does not follow ohm's law. As the temperature increase, the resistance increases. There is not a fixed relationshio between resistance and voltage.

Question 33

1 milliamp is equal to ...

Answer 33

0.001 Amps

Question 34

1 kilovolt (kV) is equal to...

Answer 34

1000 Volts

Question 35

If you find the gradient of a voltage vs current graph what are you calculating?

Answer 35

The resistance