Physics Electricity Test Flashcards Preview

S3 exams > Physics Electricity Test > Flashcards

Flashcards in Physics Electricity Test Deck (30):
1

Two basic types of circuit are?

Series and parallel

2

What is an electrical current

The movement of charge between the terminals of an energy source

3

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

A full conducting path
A source of electrical energy

4

What do electrical conductors do and electrical insulators don’t

Allow electricity to flow through them

5

What is electric current

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

6

What is currents mathematical equation

I=Q/T

7

What is potential difference

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

8

What is the formula for potential difference

V=E/Q

9

What is charge measure with

An ammeter

10

What is potential difference measured with

A voltmeter

11

What affects resistance

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

12

What is ohms law

V=IR

13

What is potential difference directly to proportionate too

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

14

What is resistance

The opposition to the flow of charge

15

What is resistance measured in

Ohms

16

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

The lowest split of current

17

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

Highest share of voltage

18

What is power

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

19

What is the formula for power

P=E/T

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

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

21

What is a direct current (d.c.)

A current which flows in only one direction

22

What is an alternating current (a.c.)

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

23

What is the main electricity voltage in the UK

230 volts

24

What is a potential divider

Two components connected in series, usually resistors

25

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

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

26

What is an LDR

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

27

What is a thermistor

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

28

What is a protection resistor

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

29

What is a transistor

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

30

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

1. 0.7 volts
2. 2 volts