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Question 1

How to calculate Current?

Answer 1

Time

Question 2

What is Charge measured in?

Answer 2

Coulombs

Question 3

How to calculate Charge?

Answer 3

Current x Time

Question 4

What is Conventional Current?

Answer 4

Current that flows from positive to negative

Question 5

What is Electron flow?

Answer 5

Current that flows from negative to positive

Question 6

What is an electrical insulator?

Answer 6

An electrical insulator’s internal electrons don’t move freely and therefore can’t conduct current

Question 7

How do you measure Current using an Ammeter?

Answer 7

You put the ammeter in series with what you are measuring

Question 8

What does current do in a parallel circuit when it splits in to 2 paths?

Answer 8

The current splits in half

Question 9

Does the current remain the same throughout a series circuit?

Answer 9

Yes

Question 10

Does the current remain the same throughout a parallel circuit?

Answer 10

No

Question 11

What is Voltage?

Answer 11

Similar to a push from a battery that makes a flow

Question 12

What can voltage be alternatively named?

Answer 12

Potential Difference

Question 13

How do you measure voltage using a Voltmeter?

Answer 13

Put in parallel with what you are measuring

Question 14

What does Voltage do in a series circuit?

Answer 14

It splits across each resistor

Question 15

How does voltage behave in a parallel circuit?

Answer 15

Voltage remains the same across each branch of the circuit

Question 16

What happens to voltage when cells are added in Series?

Answer 16

It increases

Question 17

What happens to voltage when cells are added in parallel?

Answer 17

Stays constant

Question 18

What does Ohm’s Law State?

Answer 18

The current through a conductor is Directly Proportional to the Voltage across it provided the temperature is constant

Question 19

What is a Non-Ohmic resistor?

Answer 19

A conductor which does not give a straight line in a Voltage/Current graph

Question 20

How to calculate Voltage?

Answer 20

Voltage = Current x Resistance

Question 21

How to calculate resistance?

Answer 21

Resistance = Voltage
———
Current

Question 22

What is the definition of Resistance?

Answer 22

Resistance is the opposition of a conductor to a current

Question 23

What causes resistance?

Answer 23

The heating effect

Question 24

What is the heating effect?

Answer 24

When current flows through a resistance, electrons collide atoms. Electrons may then lose energy, and atoms gain it, and start vibrating. This creates heat.

Question 25

How does resistance behave if you place resistors on series?

Answer 25

Resistors act as one large resistor. Eg. 3 resistors in series = 1 large resistor

Question 26

How does resistance behave if you place resistors in parallel?

Answer 26

The inverse of the sum of the inverse of the resistances acts as one resistance. Eg. 1/R eff= 1/R + 1/R + 1/R 1/R eff= 1/3R R eff = 1/ 1/3R R eff = 3 R

Question 27

What is the definition of Electric Current?

Answer 27

Electric current is the rate of flow of charge

Question 28

How to calculate Power?

Answer 28

Power = Current x Voltage

Question 29

How to calculate Energy Changed?

Answer 29

Energy changed = Power (OR IxV) x Time

Question 30

How to calculate cost of energy?

Answer 30

Energy (kWh)= Power (kW) x Time (h) Multiply this kWh by cost

Question 31

What is the function of the Earth wire in a plug?

Answer 31

A safety wire. If short circuit occurs, current flows down earth wire so that casing of plug doesn't become live and electrocute someone

Question 32

What is the function of the fuse in a plug?

Answer 32

Designed to melt if too large a current flows through it, so as to protect appliance from catching fire

Question 33

What is the function of the Live wire in a plug?

Answer 33

Input to the device

Question 34

What is the function of the Neutral wire in a plug?

Answer 34

Output of the device

Question 35

What is Double Insulation?

Answer 35

This is for devices that don't have earth wires. They are completely plastic so that casing can't become live

Question 36

How do you know what fuse to use for your appliance?

Answer 36

Calculate what current usually flows through appliance. Choose fuse that melts when it is just above normal current

Question 37

What is a magnetic field?

Answer 37

This is the region around a magnet, where it has a magnetic effect

Question 38

What happens when a magnetic material is placed in a magnetic field?

Answer 38

It will experience a force

Question 39

Is a magnetic field created around a conductor when electric current flows through it? What is this called?

Answer 39

Yes, electromagnetism

Question 40

If a coil was wrapped around a magnet and current was conducted through it, how would you be able to tell the direction of the Magnetic Field and the Poles of the Magnet?

Answer 40

Right hand grip rule

Question 41

What is the right hand grip rule?

Answer 41

If you were holding on to a magnet wrapped in electric coil with your right hand, using your fingers to display the direction of current, your thumb will indicate the position of the North Pole

Question 42

What is the Motor Effect? Give a use of it?

Answer 42

A current carrying conductor in a magnetic field experiences a force. This is how electric motors work

Question 43

How to calculate energy? (Using Charge and Voltage)

Answer 43

Energy = Charge x Voltage

Question 44

How to calculate Power? (Using Current and Voltage)

Answer 44

Power = Current x Voltage