Exam Topic 1 - Electricity

Question 1

Conductors

Answer 1

Delocalised atoms in substances that are free between atoms.

Question 2

Parallel circuit formula

Answer 2

Calculated by adding up the reciprocals of the resistance valves and then taking the reciprocal of the total. (R=(1/R+1/R2+1/R3).

Question 3

Are atoms positive or negative?

Answer 3

Positive

Question 4

What happens when the electrons can jump across a gap to equalise the charge?

Answer 4

All of the energy stored in the electrons converts to heat, light, sound and kinetic energy (movement).

Question 5

What is the unit used to measure current?

Answer 5

Ampere (A)

Question 6

Current electricity

Answer 6

The movement of charge/electrons through an electrical circuit

Question 7

What does static electricity rely on?

Answer 7

Stationary electrons

Question 8

Electric current

Answer 8

The movement of charge on an electrical circuit.

Question 9

What are the two types of current electricity and what are they?

Answer 9

Direct current (DC) - One direction, Alternating current (AC) - Alternating directions

Question 10

What does an ammeter measure

Answer 10

The amount of charge that flows through it every second

Question 11

What pushes the electrons on a wire?

Answer 11

Battery

Question 12

Do positive or negative charges move?

Answer 12

Negative charges move, positive don’t.

Question 13

What do you use to measure resistence?

Answer 13

Multimeter.

Question 14

What is the unit for resistence?

Answer 14

Ohms

Question 15

Are electrons positive or negative?

Answer 15

Negative

Question 16

Static Electricity

Answer 16

The build up of charge on a surface

Question 17

What does a high or low resistence mean?

Answer 17

A high resistence means that it is difficult for electrons to pass through a material a low resistence means the opposite

Question 18

Insulators

Answer 18

Electrons stuck in rigid positions

Question 19

Series circuit

Answer 19

All components on the same pathway

Question 20

Symbol for current

Answer 20

I

Question 21

Unit for voltage

Answer 21

Volts

Question 22

Parallel circuit

Answer 22

an electrical path that branches so that the current divides and only part of it flows through any branch

Question 23

Another way to describe voltage?

Answer 23

The energy needed to move a unit charge to flow between two points

Question 24

Resistence

Answer 24

When electrons pass along the wires of an electric current their path is restricted a little by the atoms that make up the wires

Question 25

What happens if a charge becomes to great?

Answer 25

The electrons can jump across a gap to equalise the charge.

Question 26

What instrument is used to measure current?

Answer 26

Ammeter

Question 27

What does resistance depend on?

Answer 27

Type of material, length of wire, thickness of wire, temperature of wire.

Question 28

What is ohm’s law

Answer 28

Current = Volts/resistence

Question 29

Parallel circuit

Answer 29

All components not on the same pathway

Question 30

Voltage

Answer 30

Potential energy in the circuit

Question 31

Series Circuit

Answer 31

All components have the same current through them but we split the voltage between them.

Question 32

What is the total resistence of a series circuit + formula

Answer 32

Equal to each of the resistences added together (R = R1+R2+R3).

Question 33

What is the release of energy

Answer 33

Spark