T3 Physics

Question 1

What is static electricity?

Answer 1

Is when an object obtains a net charge (positive or negative) on its surface. Objects can become charged due to electrons transferring from one object to another when they rub against each other.

Question 2

What are some examples of static electricity?

Answer 2

printers, photocopiers, lightning, paint sprayers and filters

Question 3

What is current electricity?

Answer 3

Is when charges (electrons) are able to move through a substance like a metal wire in a circuit.

Question 4

What are some examples of current electricity?

Answer 4

Motors & Generators

Question 5

What is voltage?

Answer 5

The amount of energy given to the charges, measured in volts (V)

Question 6

What is temperature gradient?

Answer 6

describes direction and rate at which temperature changes in a given area

Question 7

List components of a circuit:

Answer 7

light globe, switch, voltmeter, ammeter, resistor, battery, connecting wire, electric motor & electric bell

Question 8

What is heat/thermal energy?

Answer 8

total energy of molecular motion in a substance (Joules J)

Question 9

What is temperature?

Answer 9

measure of the average energy (degrees Celsius)

Question 10

What are 3 methods of heat transfer?

Answer 10

1. conduction (solids)
2. convection (liquids & gases)
3. radiation (through vacuum)

Question 11

What is conduction?

Answer 11

thermal energy transfer through solids (requires particles)

Question 12

What are examples of good conductors?

Answer 12

metals & copper

Question 13

What are examples of poor conductors?

Answer 13

wood & plastic

Question 14

What is convection?

Answer 14

thermal energy transfer through liquids & gases eg. sea breeze (requires particles)

Question 15

What do the particles/electrons of a solid look like?

Answer 15

lined up tightly compacted with freely moving electrons in the particles

Question 16

What do the particles/electrons of a liquid look like?

Answer 16

freely moving particles and electrons / can adapt to other shapes & containers

Question 17

What happens to particles when they receive thermal energy?

Answer 17

particles move away from each other and become less dense and rise

Question 18

What do the particles/electrons of a gas look like?

Answer 18

freely moving particles and electrons

Question 19

What are convection currents?

Answer 19

push movement of particles from the source of heat from high to low temperature

Question 20

What is a series circuit?

Answer 20

If two or more resistors are arranged one after the other, they are said to be in series.The supplied voltage is divided up amongst the resistors The supplied current is not shared and remains the same If globes are connected in series, each globe added makes them glow more dimly. If one of the components in the circuit breaks, then the whole circuit fails

Question 21

What is thermal radiation

Answer 21

moves through a vacuum/space travels in waves - transverse waves/longditudial waves (no particles)

Question 22

What are the most dangerous waves?

Answer 22

Gamma waves - damage cells eg. kill cancer

Question 23

What are the safest waves?

Answer 23

Radio waves

Question 24

What is light made up of?

Answer 24

Rainbow (ROYGBIV)

Question 25

What are infrared waves?

Answer 25

light and electromagnetic waves of any frequency will heat surfaces that absorb them. It travels in straight lines, can travel through a vacuum, don't require particles to travels and travels at speed of light. lower frequency to Gamma & higher frequency to Radio

Question 26

What is Ohm's Law?

Answer 26

V= IR (triangle) V= voltage I = current R = resistance

Question 27

what is the greenhouse effect?

Answer 27

Co2 from earth causes a blanket on the earth and the sun is heating up the earth internally and the heat is being trapped in. so the internal temperature increases.

Question 28

how do you make the electricity in the home safer?

Answer 28

use FUSES which prevent electrocution and electrical fires

Question 29

what is the effect on climate change?

Answer 29

extreme weather conditions

Question 30

what is an insulator?

Answer 30

something that doesn't allow heat or electricity to transfer eg. metals & wool/cotton