Physics Electricity Test

Question 1

Two basic types of circuit are?

Answer 1

Series and parallel

Question 2

What is an electrical current

Answer 2

The movement of charge between the terminals of an energy source

Question 3

What must there be for a current to flow in a circuit

Answer 3

A full conducting path

A source of electrical energy

Question 4

What do electrical conductors do and electrical insulators don’t

Answer 4

Allow electricity to flow through them

Question 5

What is electric current

Answer 5

The amount of charge transferred per unit of time (the rate of flow of charge)

Question 6

What is currents mathematical equation

Answer 6

I=Q/T

Question 7

What is potential difference

Answer 7

The amount of energy given to one coulomb of charge passing through a supply

Question 8

What is the formula for potential difference

Answer 8

V=E/Q

Question 9

What is charge measure with

Answer 9

An ammeter

Question 10

What is potential difference measured with

Answer 10

A voltmeter

Question 11

What affects resistance

Answer 11

Length of resistor
Thickness of resistor
Temperature of resistor
Material of resistor

Question 12

What is ohms law

Answer 12

V=IR

Question 13

What is potential difference directly to proportionate too

Answer 13

If at a constant temperature, potential difference is directly proportionate to the current flowing through it

Question 14

What is resistance

Answer 14

The opposition to the flow of charge

Question 15

What is resistance measured in

Answer 15

Ohms

Question 16

In a parallel circuit the branch with the highest resistance will have

Answer 16

The lowest split of current

Question 17

In a series circuit the component with the highest resistance will have the

Answer 17

Highest share of voltage

Question 18

What is power

Answer 18

A measure of energy transferred each second in a circuit. Measured in watts

Question 19

What is the formula for power

Answer 19

P=E/T

Question 20

What is the formula of power when

1. Current and potential difference are known
2. When current and resistance are known
3. When potential difference and resistance are known

Answer 20

1. P=IV
2. P=IsquaredR
3. P=vsquared/R

Question 21

What is a direct current (d.c.)

Answer 21

A current which flows in only one direction

Question 22

What is an alternating current (a.c.)

Answer 22

A current which flows in two direction and changes throughout its journey.

Question 23

What is the main electricity voltage in the UK

Answer 23

230 volts

Question 24

What is a potential divider

Answer 24

Two components connected in series, usually resistors

Question 25

What is the equation to find a voltage of one of the resistors

Answer 25

V=(R1/R1+R2) x supply voltage

Question 26

What is an LDR

Answer 26

A light dependant resistor which as the light lèvera increases the resistance decreases

Question 27

What is a thermistor

Answer 27

A thermistor is a component which depends on temperature as when the temperature increases the resistance decreases.

Question 28

What is a protection resistor

Answer 28

It is a resistor set in place specifically to stop a component from overheating or being overworked

Question 29

What is a transistor

Answer 29

It is a circuit used as an electronic switch. It switches on at a certain voltage depending on if it is a mosfet or NPN

Question 30

When does

1. An NPN switch on
2. A mosfet switch on

Answer 30

1. 0.7 volts

2. 2 volts