Electricity Physics

Question 1

What is Current

Answer 1

Flow of electrical charge

Question 2

What is Potential Difference

Answer 2

Force that pushes current around

Question 3

What is Resistance

Answer 3

Slows the flow of charge

Question 4

Neutral Wire

Answer 4

Carries away current, blue

Question 5

Earth Wire

Answer 5

For safety, green and yellow

Question 6

Live Wire

Answer 6

Provides alternating potential difference from mains, brown

Question 7

conduction

Answer 7

transfer of electrons when one object touches another

Question 8

conductor

Answer 8

a material in which charges can move easily. Most metals are fit this description because some of the electrons in metals are free to move about (they are delocalised).

Question 9

insulator

Answer 9

a material in which charges cannot easily move

Question 10

parallel circuit

Answer 10

a circuit in which different loads are located on separate branches. The charges travel through more than one path.

Question 11

simple or series circuit

Answer 11

a circuit in which all parts are connected in a single loop

Question 12

voltage

Answer 12

The amount of energy given to each coulomb of charge. Measured in volts.

Question 13

Resistance

Answer 13

A measure of the opposition to the flow of current. Measured in Ohms

Question 14

Current

Answer 14

The number of coulombs of charge to flow past a point per second. Measured in amps.

Question 15

Diode

Answer 15

A device used in circuits which only allows current to pass in one direction.

Question 16

Resistor

Answer 16

A component that is used to control current in many circuits.

Question 17

Thermistor

Answer 17

A temperature dependent resistor. This can be used as a sensor in a circuit. Normally with these devices the resistance decreases as the temperature increases.

Question 18

Variable Resistor

Answer 18

Often used as volume controls or dimmer switches the resistance of this component can be adjusted.

Question 19

Ammeter

Answer 19

A device used in series to measure electrical current.

Question 20

Voltmeter

Answer 20

A device used in parallel to measure the voltage across a component or section of a circuit.

Question 21

plug wiring

Answer 21

Remember the second letter from each wire. bLue - Left, bRown - Right and sTripes - Top