P4

Question 1

Advantages of a circuit diagram

Answer 1

Shows how components in a circuit are connected

Question 2

What is the difference between a cell and a battery

Answer 2

A cell is one
A battery is more than one

Question 3

What symbol is this

Answer 3

Cell

Question 4

What symbol is this

Answer 4

Ammeter

Question 5

What symbol is this

Answer 5

Voltmeter

Question 6

What symbol is this

Answer 6

LDR

Question 7

What is an electric current

Answer 7

An electric current is the flow of charge

Question 8

What is current measured in

Answer 8

Amperes (amps)

Question 9

What is the equation linking current time and charge

Answer 9

Current = charge / time

Question 10

What is this symbol

Answer 10

Battery

Question 11

What is this symbol

Answer 11

Fuse

Question 12

What is this symbol

Answer 12

Resistor

Question 13

What is this symbol

Answer 13

LED

Question 14

What is this symbol

Answer 14

Switch (closed)

Question 15

What is this symbol

Answer 15

Switch (open)

Question 16

What is this symbol

Answer 16

Thermistor

Question 17

What is this symbol

Answer 17

Variable resitor

Question 18

What is charge measured in

Answer 18

Coloumbs

Question 19

What is a cell

Answer 19

Provides the “push” for electrons in a circuit

Question 20

What is the function of an ammeter

Answer 20

Used to measure current (amps)

Question 21

What is the function of a voltmeter

Answer 21

Used to measure potential difference (voltage)

Question 22

What is the function of a bulb/lamp

Answer 22

Emits light when current passes through it

Question 23

What is an LDR

Answer 23

Light dependent resistor

Question 24

What is the function of a fuse

Answer 24

Melts and breaks the circuit if the current is too high

Question 25

What is the function of a resistor

Answer 25

Limits the current in a circuit

Question 26

What is the function of an LED

Answer 26

Emits light when current passes through it

Question 27

What is potential difference/voltage

Answer 27

Amount of work done (energy transferred) by each of coloumb of charge that passes through the circuit between two points

Question 28

What equation links potential difference /voltage , Energy (J) and Charge(C)

Answer 28

PD = E/Ch

Question 29

What is the function of a switch

Answer 29

Emables current in a circuit to be switched on or off

Question 30

What is a thermistor

Answer 30

Temperature dependant resistor

Question 31

What is the function of a varaible resistor

Answer 31

Allows current to be varied

Question 32

What is electrical resistance

Answer 32

Electrical resistance ina circuit is the opposition to the flow of charge

Question 33

What is the unit for electrical resitance

Answer 33

OHMS (Ω)

Question 34

What factors affect the resistance in a wire

Answer 34

-temperature -diameter of the wire -length of the wire -Conductivity of wire material

Question 35

What is Ohms law

Answer 35

The current at constant temperature is directly proportional to the voltage (potential difference) across the resistor

Question 36

How is volatage proportional to current

Answer 36

As voltage increases current increases, directly proportional

Question 37

What is the equation that links voltage, current and resistance

Answer 37

Voltage= current(A)x resistance(Ω)

Question 38

what happens to the current in a series circuit if more components are added

Answer 38

The current stays the same

Question 39

What happens to the voltage in a series circuit if more components are added

Answer 39

The total voltage is of the supply is shared between the components in series

Question 40

How do you find the total resistance in a series circuit

Answer 40

Add up all resistance in the circuit