Electricity

Question 1

What is current

Answer 1

Flow of charge in a current
Electron flow

Question 2

What is a series circuit

Answer 2

Only one path for electrons to flow

Question 3

What is a parallel circuit

Answer 3

Multiple paths for the electrons to flow

Question 4

What is potential difference / voltage

Answer 4

What pushes electrons around a circuit

Question 5

What unit is potential difference measured in

Answer 5

Volts V

Question 6

What is voltage measured

Answer 6

Volt Meter

Question 7

What is the current

Answer 7

The amount of charge flowing each second

Question 8

What unit is current measured in

Answer 8

Amos A

Question 9

What is current measured by

Answer 9

Ameter

Question 10

What is equation for charge

Answer 10

Change (c) = current (A) x time (s)

Question 11

Equation for energy

Answer 11

Energy (J) = charge (C) x potential difference (V)

Question 12

What is resistance

Answer 12

Difficulty with which charge passes through a material 

Question 13

What unit is resistance measured in? 

Answer 13

Ohms

Question 14

What is the resistance of conductors? 

Answer 14

Low resistance 

Question 15

What is the resistance of insulators? 

Answer 15

High resistance 

Question 16

Equation for resistance 

Answer 16

Current = potential difference / resistance
I = V/R

Question 17

What is a resistor do? 

Answer 17

Controls how much current goes to each part of the circuit 

Question 18

How do you work the total resistance of a circuit? 

Answer 18

The sum of the resistors in the circuit 

Question 19

What is the resistance on a resistor?

Answer 19

Fixed 

Question 20

What is the resistance of an LDR when it is dark?

Answer 20

High resistance 

Question 21

What is the resistance of an LDR when it’s light? 

Answer 21

Low resistance 

Question 22

What is the resistance of a thermostat when it’s cold? 

Answer 22

Higher resistance 

Question 23

What is the resistance of a thermometer when it’s hot? 

Answer 23

Low resistance 

Question 24

What is the resistance of a diode and the current flows backwards? 

Answer 24

Higher resistance 

Question 25

What is the resistance of a diode when the current flows forward? 

Answer 25

Low resistance 

Question 26

What is the resistance of a filament lamp when it’s hotter? 

Answer 26

High resistance 

Question 27

What is the resistance of a filament man when it’s cooler? 

Answer 27

Resistance 

Question 28

What kind of diode do? 

Answer 28

Have current flowing backwards 

Question 29

What is the graph of a resistor? 

Answer 29

Y=X Directly proportional 

Question 30

Steps for the core practical investigating resistance 

Answer 30

1) set up three circuits 2) Set power pack to one volt on each circuit  3) Record readings on each ammeter and bolt meter 4) repeat with each voltage from one volt to 6 V 5) repeat with each circuit 

Question 31

What are the three circuits you set up for the investigating resistance practical? 

Answer 31

1) standard circuit with resistor  2) One with two bulbs in a series  3) One with two bulbs parallel to each other 

Question 32

What is found out from the investigating resistant practical? 

Answer 32

Increase the current increase voltage Increase the resistance decreases the current 

Question 33

What was the difference between the series and the parallel circuit in the investigating resistance practical? 

Answer 33

Series - current was the same the whole way through but the voltage was shared equally between the 2 bulbs Parallel - the voltage was the same at each bulb as the power pack but the current got equally split

Question 34

How can resistance transfer energy? 

Answer 34

In the form of heat 

Question 35

How does resistance transfer energy to heat?

Answer 35

The electron travelling through the metal bumps into the atoms making them vibrate The vibrations causes the atoms to heat up

Question 36

What does electrical energy transfer into

Answer 36

Something + thermal

Question 37

What is is called when thermal energy is wasted

Answer 37

Dissipation

Question 38

What is direct current DC

Answer 38

Electrons flow in a single continuous direction

Question 39

What is Alternating current AC

Answer 39

Electrons switch direction many times a second

Question 40

What is the domestic supply at our homes

Answer 40

AC with frequency of 50 Hz and voltage of 230 V

Question 41

Why do plugs have fuses and circuit breakers

Answer 41

To prevent fires and hazards

Question 42

How does a fuse work

Answer 42

A thin wire that melts when there is to much current (as it’s too hot ) breaking the circuit

Question 43

What are the disadvantages of fuses

Answer 43

Can be slow to replace

Question 44

How do circuit breaks work

Answer 44

If too much current flows through something a switch will flip down and turn off the current very quickly

Question 46

What is the advantages of circuit breakers

Answer 46

Easy to reset