Physics

Question 1

What is a current?

Answer 1

A current is the amount of charge flowing per second

Question 2

What are the charges that flow in a circuit?

Answer 2

The charges that flow in a circuit are electrons.

Question 3

Are electrons positively or negatively charged?

Answer 3

Electrons are negatively charged.

Question 4

Current is measured in what unit?

Answer 4

Amps (A).

Question 5

What piece of equipment is a current measured by?

Answer 5

An ammeter.

Question 6

Which type of circuit has only one loop?

Answer 6

A series circuit.

Question 7

How many loops does a parallel circuit have?

Answer 7

More than one circuit.

Question 8

What is potential difference?

Answer 8

It is the amount of energy transferred by the cell or battery to the charges.

Question 9

Where are protons located in the atom?

Answer 9

They are located in the nucleus of the atom.

Question 10

Are protons negatively or positively charged?

Answer 10

Positively charged.

Question 11

What does an atom contain?

Answer 11

An atom contains a central nucleus with electrons orbiting around the outside in shells.

Question 12

Is a neutron positively or negatively charged?

Answer 12

Trick question, it is neutrally charged.

Question 13

What is static electricity?

Answer 13

It is when two insulators are rubbed together which causes electrons to be transferred.

Question 14

Finish the sentences:

Like charges will _____, opposite charges will _______.

Answer 14

1. Repel

2. Attract

Question 15

What is resistance?

Answer 15

It is the measure of how easy or how hard it is for charges to pass through a component in a circuit.

Question 16

What unit is resistance measured in?

Answer 16

Ohms (Omega).

Question 17

What is the unit of potential difference?

Answer 17

Volts (V).

Question 18

What piece of equipment do you use to measure potential difference?

Answer 18

A voltmeter.

Question 19

What is the formula for resistance?

Answer 19

Resistance = Potential difference / current.

Question 20

Finish the sentence(s):
Materials with high resistance are said to be __________
Materials with low resistance are said to be __________

Answer 20

1. Insulators

2. Conductors

Question 21

What is energy measured in?

Answer 21

Joules or Kilojoules.

Question 22

Finish the sentence:

The total energy before a change is always _____ __ _____ ______ _____ _ ______.

Answer 22

1. Equal to the total energy after a change

Question 23

Name five different energy stores.

Answer 23

• Chemical
• Thermal
• Kinetic
• Gravitational potential
• Elastic potential

Question 24

Where is chemical energy found in?

Answer 24

Foods, fuels and batteries.

Question 25

Where can thermal energy be found?

Answer 25

Hot objects.

Question 26

Where can kinetic energy be found?

Answer 26

In moving objects.

Question 27

Where can elastic potential energy be found?

Answer 27

In anything that is stretching or squeezing.

Question 28

What is power a measure of?

Answer 28

How much energy is transferred per second.

Question 29

What unit is power measured in?

Answer 29

Watts (W).

Question 30

What is the formula for calculating power?

Answer 30

Power = energy / time

Question 31

What is efficiency?

Answer 31

It is a measure of how much energy was used in a useful way.

Question 32

What is the equation for measuring efficiency?

Answer 32

Efficiency (%) = Useful energy output / energy input x 100

Question 33

What is light reflecting of a smooth surface called?

Answer 33

Specular reflection.

Question 34

1. What happens when light reflects of a rough surface? | 2. What do we call this?

Answer 34

1. The light will not form an image. | 2. Diffuse scattering.

Question 35

Finish the equation: | angle of incidence = _____ __ ________

Answer 35

angle of reflection

Question 36

Complete the sentence: | The closer the waves are, the higher the _________

Answer 36

Frequency.