Electricity

Question 1

What is electric current?

Answer 1

The movement of charge (electrons) through a closed conducting circuit.

Question 2

What is required for electric current to flow through a circuit? (2)

Answer 2

A closed switch (no break in circuit)
A cell or sourse of energy

Question 3

What is charge?

Answer 3

Electric charge are the electrons flowing through the circuit.

Question 4

What is the symbol for charge?

Answer 4

Q

Question 5

What is current strength?

Answer 5

The rate at which electrons flow through a circuit: fast or slow.

Question 6

What is the symbol for current?

Answer 6

I

Question 7

What is the unit of measurement of current?

Answer 7

Amperes (A)

Question 8

How does a cell store chemical substances?

Answer 8

As chemical potential energy.

Question 9

What is the stored energy in a cell called?

Answer 9

Potential different or voltage.

Question 10

What happens when a cell is connected to an external circuit?

Answer 10

These chemical substances react to produce electrical charge with a high potential energy.

Question 11

What is the energy transfer carried out by the cell?

Answer 11

Chemical potential energy ➡️ Electrical potential energy

Question 12

What happens as the charge leaves the positive terminal of the cell and enters the wires?

Answer 12

It has a high kinetic energy.

Question 13

What happens when charge reaches a resistor?

Answer 13

The use/expand a lot of their energy and the electrons return to the negative terminal of the cell.

Question 14

What happens once electrons have returned to the cell?

Answer 14

They are recharged with high potential energy so that they can re-enter the circuit.

Question 15

What is a battery?

Answer 15

More than one cell connected together in series.

Question 16

What does an increase in cells in series result in?

Answer 16

Increase strength of current. Increase potential different across cells.

Question 17

What happens when adding cells in parallel?

Answer 17

Potential difference and current stays the same.

Question 18

What happens when adding resistors in parallel?

Answer 18

Decrease in total resistance which therefor increases the current.

Question 19

What happens when adding resistors in series?

Answer 19

There’s an increase in total resistance and decrease in total current.

Question 20

What happens to the total current in series?

Answer 20

It remains the same throughout?

Question 21

What happens to the total current in parallel?

Answer 21

It splits amongst the different branches.

Question 22

What do the resistors do in series?

Answer 22

Divide total voltage.

Question 23

What happens to the current and potential difference in parallel?

Answer 23

The current splits, but the potential difference is the same throughout.

Question 24

What is resistance?

Answer 24

The opposition to the flow of current.

Question 25

What is the symbol for resistance?

Answer 25

R

Question 26

What is the unit of resistance?

Answer 26

Ohm

Question 27

What is a conductor?

Answer 27

Substances that allow charge to flow through them.

Question 28

What are resistors?

Answer 28

Conducting materials chosen to control current or to provide useful energy transfer.

Question 29

What are the four factors that impact resistance?

Answer 29

Material of conductor.
Thickness of conductor.
Length of conductor.
Temperature of conductor.

Question 30

Which thickness of wire has more resistance?

Answer 30

Thinner wires offer more resistance than thicker wires.

Question 31

What length of conductor offers more resistance?

Answer 31

Longer wires offer more resistance than shorter wires.

Question 32

What temperature of the conductor has a higher resistance?

Answer 32

Hotter conductors have higher resistance than colder conductors.