P4-Electricity

Question 1

There are the same number of what as protons in an atom?

Answer 1

Electrons

Question 2

What do you call a charged atom?

Answer 2

An ion

Question 3

Do like charged repel or attract?

Answer 3

Repel

Question 4

Describe what happens when 2 insulating materials are rubbed together?

Answer 4

Some electrons would be rubbed off one insulator on to the other through friction.

Question 5

What is transfered when objects become charged?

Answer 5

Electrons

Question 6

What kind of force acts between charges

Answer 6

A non contact force.

Question 7

What does a cell do ?

Answer 7

It provided the circuit with a source of potential difference

Question 8

What does a resistor do?

Answer 8

It limits the flow of current

Question 9

What does a thermistor do?

Answer 9

As the temperature increases the resistance decreases and vice versa.

Question 10

What is a LDR?

Answer 10

It is like a thermistor but with light.

Question 11

What does a diode do?

Answer 11

It allows current to flow in one direction only.

Question 12

What does a fuse do?

Answer 12

It explodes when a current above a certain number passes through

Question 13

What does a voltmeter measure?

Answer 13

The potential difference.

Question 14

What does an ammeter measure?

Answer 14

The current

Question 15

An electric current is the flow of what?

Answer 15

Electrons

Question 16

Why are metals good conductors of electricity?

Answer 16

As the electrons are free to move between the atoms.

Question 17

What is the equation for charge?

Answer 17

Charge(Q)= current(I) x time(T)

Question 18

What is charge measured in?

Answer 18

Coulombs

Question 19

What is current measured in?

Answer 19

Amps

Question 20

What is time measured in?

Answer 20

Seconds

Question 21

What is the equation for energy transfered?

Answer 21

Energy transfered (E)= Charge (Q) x potential difference (V)

Question 22

What is potential differences measured in?

Answer 22

Volts

Question 23

What is energy transfered measured in?

Answer 23

Joules

Question 24

What is Ohm’s law?

Answer 24

Potential difference(V) = Current(I) x Resistance(R)

Question 25

What is resistance measured in?

Answer 25

Ohms

Question 26

What does directly proportional mean?

Answer 26

When a graph is a straight line through the origin.

Question 27

What is current?

Answer 27

The flow of charged particles.

Question 28

What does the current do in parallel and series’s circuits?

Answer 28

In a series circuit all the components have the same amount of current flowing through them and in a parallel the current splits between the branches.

Question 29

What does the voltage do in a series and parallel circuit?

Answer 29

In a series circuit the voltage splits between the components but in a parallel it stays the same.

Question 30

How does resistance work in a series circuit?

Answer 30

The resistance of the components is added together, so more resistors means more resistance.

Question 31

How does resistance work in a parallel circuit?

Answer 31

The resistance splits between the branches , so more resistors means an overall decrease in resistance. this is as when you add another loop it gives the electrons more options and therefore decreases the resistance

Question 32

What direction does current flow?

Answer 32

Clockwise - from the positive terminal to the negative terminal.

Question 33

What is the current?

Answer 33

The current is the rate at which the electrons flow past a point in a circuit