Physics Major

Question 0

What is resistance measured in?

Answer 0

Ohms

Question 1

Resistance

Answer 1

Measure of the DIFFICULTY the charges have in moving through a circuit.

Question 2

Factors which affect resistance

Answer 2

Length
Substance
Temp
Thickness

Question 3

High resistance - _______ current

Answer 3

Low

Question 4

Low resistance - ________ current

Answer 4

High

Question 5

As the length of the wire increase, resistance _____

Answer 5

Increases

Question 6

As the thickness increases, the resistance _______

Answer 6

Decreases

Question 7

Highest resistance wife

Answer 7

Nichrome

Question 8

Lowest resistance wire

Answer 8

Gold

Question 9

As the temperature increases, the resistance ?

Answer 9

Increases

Question 10

Conditions for wire to have small resistance

Answer 10

Short, thick, gold, cold

Question 11

Wire to have high resistance

Answer 11

Long, thin, nichrome, hot

Question 12

Advantage of parallel circuits

Answer 12

Independent control of lights ( if one breaks, others still function)

Question 13

Advantages of series circuits

Answer 13

Cheaper

Energy efficient

Question 14

Eg of series lights

Answer 14

Christmas lights

Question 15

Eg of parallel lights

Answer 15

House lights

Car lights

Question 16

Total resistance of resistors in series

Answer 16

All resistance added up

Question 17

Total resistance of Parallel resistors

Answer 17

Total resistance is less than the resistance of the lowest resistor

Question 18

Types of energy

Answer 18

Electrical energy
Kinetic
Heat 
Light
Sound

Question 19

Conditions of electrocution

Answer 19

Touching two conductors

Different electrical potentials

Question 20

Active wire

Answer 20

Wire that carries electricity to the house and different parts of the house

Question 21

Neutral wire

Answer 21

Carrys back 0v of electricity to the power station to complete circuit

Question 22

Double insulation

Answer 22

Each wire has two layers of insulation around it

Question 23

When is two pin plug used

Answer 23

Use of appliances with insulating cases

Question 24

When is three pin plug used

Answer 24

Appliances with metal casings

Question 25

Color of active wire

Answer 25

Red or brown

Question 26

Color of neutral wire

Answer 26

Blue or black

Question 27

Color of earth wire

Answer 27

Green or yellow

Question 28

Fuse

Answer 28

Breaks a circuit by melting when a large current passed through it

Question 29

Circuit breaker

Answer 29

Excessive current trips the switch and break circuit

Question 30

Earth wire

Answer 30

Low resistance wire that connects metal frames of electrical appliances to the ground

Question 31

Safety switch

Answer 31

When a large difference in current us detected flowing through the active and current wire, the switch breaks so person isn't electrocuted

Question 32

Cost of electricity can be ccated by

Answer 32

Cost = power x time x 30 cents

Question 33

1kw = W

Answer 33

1000 w

Question 34

What happens when too much current flows in an elect magnetic circuit breaker

Answer 34

Cool creates a large magnetic fis which attracts the iron and breaks circuit