Topic2

Question 1

What is Current?

Answer 1

It is the Flow of charge

Question 2

What is the Unit for Current?

Answer 2

Amps (A)

Question 3

What do we use to measure Current?

Answer 3

Ammeter

Question 4

In a series is circuit what is the current?

Answer 4

The current is the same all the way around.

Question 5

Ammeter are always connected to what type of circuit?

Answer 5

Series circuit

Question 6

Voltmeters are always connected to what type of circuit?

Answer 6

Parallel circuits

Question 7

In a parallel circuit what is the current?

Answer 7

Total current equal to sum of currents through each branch.

Question 8

What is the Potential difference in a series circuit?

Answer 8

Shared between components

Question 9

What is the potential difference in a Parallel circuit?

Answer 9

Equal across each branch

Question 10

What is the Total resistance of a series circuit?

Answer 10

Sum of resistances of each component

Question 11

What is the Total resistance of a Parallel circuit?

Answer 11

Less than resistance of each resistor.

Question 12

How do you find the out the Charge flow of a circuit?

Answer 12

Q(Coulombs, C)=I(Current)/time(s)

Question 13

What is the equation of Potential difference?

Answer 13

V=I(Current, Amps) x R(Resistance)

Question 14

What are the 3 I-V characteristics graphs?

Answer 14

Ohmic conductor, Filament lamp and Diode

Question 15

What is Resistance?

Answer 15

Anything that slows the flow down.

Question 16

What is Resistance measured in?

Answer 16

ohms

Question 17

What is Potential difference?

Answer 17

It is the driving force that pushes the charge around

Question 18

Does the resistance of a ohmic conductor change with the current?

Answer 18

No

Question 19

Does the resistance of a Fliament lamp and Diode change with the current?

Answer 19

yes

Question 20

What is a LDR?

Answer 20

It is a resistor that is dependent on the intensity of light

Question 21

In bright light what happens with the LDR resistance?

Answer 21

The resistance falls

Question 22

In darkness what happens with the LDR resistance?

Answer 22

The resistance is highest

Question 23

What are light Dependent resistors used for?

Answer 23

Automatic night lights

Question 24

What is a Thermistor ?

Answer 24

it is a temperature dependent resistor

Question 25

In hot conditions what happens with the resistance?

Answer 25

the resistance drops

Question 26

In cool conditions what happens with the resistance?

Answer 26

The resistance goes up

Question 27

What are Thermistor used for?

Answer 27

Temperature detectors

Question 28

What does adding a resistor in a Parallel circuit do to the total resistance?

Answer 28

It reduces the total resistance

Question 29

What are mains in the UK?

Answer 29

Alternating current (AC)

Question 30

What does Alternating current mean?

Answer 30

The current is constantly changing direction

Question 31

What is the frequency of Alternating current in the UK?

Answer 31

50Hz

Question 32

What is the potential difference of alternating current?

Answer 32

230v

Question 33

What do Cells and Batteries supply?

Answer 33

DC

Question 34

What is the Brown wire?

Answer 34

It is the live wire and it carries alternating potential difference from the mains supply

Question 35

What is the blue wire?

Answer 35

It is the neutral wire which completes the circuit, the potential difference of this wire is 0V.

Question 36

What is the Green and Yellow?

Answer 36

The earth wire it is a safety wire to stop the appliance from becoming live.

Question 37

What is the equation for Power for appliances?

Answer 37

P=E/T

Question 38

What is another equation for power of an appliance

Answer 38

power=Voltage x Current

P=VI

Question 39

How do you find the power if you don’t know the potential difference?

Answer 39

P=I2 X R

Question 40

What is an equation for energy transferred?

Answer 40

E=QV

Q= Charge flow(C)