Electricity

Question 1

What are ampere’s used for and what is its equation?

Answer 1

Current, i=q/t

Question 2

What are coulomb’s used for and what is its equation?

Answer 2

Charge
Charge = current x time
q=it

Question 3

What are joule’s used for and what is its equation?

Answer 3

Energy
Energy transferred = current x voltage x time
E
I x V x T

Question 4

What are ohm’s used for and what is its equation?

Answer 4

Resistance, v=ir

Question 5

What are volts used for and what is its equation?

Answer 5

Voltage
Voltage = current x resistance
v=ir

Question 6

What are watts used for and what is its equation?

Answer 6

Power, vi=p

Question 7

What does static electricity mean?

Answer 7

Charge that isn’t moving

Question 8

Materials which electricity will not pass through easily are called…

Answer 8

Insulators

Question 9

Materials which electricity will pass through easily are called…

Answer 9

Conductors

Question 10

What is an electric current?

Answer 10

Electric current is the rate of flow of charge

Question 11

What is voltage?

Answer 11

Voltage is the energy transferred per unit charge passed

Question 12

What is the equation for potential difference?

Answer 12

Potential difference = energy transferred (J) / charge (C)

Question 13

What is Ohm’s law?

Answer 13

For a conductor at constant temperature, the current through the conductor is proportional to the voltage across it

Question 14

What is a series circuit?

Answer 14

A series circuit is a circuit where there is only one path from the source through all of the components and back to the source. This means all of the current in the circuit must flow through all components. E.g fairy lights

Question 15

What is a parallel circuit?

Answer 15

Circuits in parallel have more than one path through all the components

Question 16

What are the four rules of series circuits?

Answer 16

1. The same current passes through all the components in series with each other
2. The total potential difference of the voltage supply in a series circuit is shared between the components
3. The total resistance of components in series is equal to the sum of the resistance of each component
4. The total potential difference of cells in series is the sum of the potential difference of each cell

Question 17

What is the word equation for Ohm’s law?

Answer 17

Resistance = potential difference (V) / current (A)

Question 18

How is power defined?

Answer 18

P.t=e
E
P T

Question 19

What is the equation for power?

Answer 19

Power = current x voltage
P=iv
P
I V

Question 20

What is wavelength?

Answer 20

The distance from one peak to the next

Question 21

What is electrical power?

Answer 21

The rate at which an appliance transfers energy

Question 22

What is the equation for electrical power?

Answer 22

Electrical power = current x voltage

Question 23

What is current?

Answer 23

The rate of flow of charge round the circuit

Question 24

What is the unit for current?

Answer 24

Amps, A

Question 25

What is voltage?

Answer 25

The driving force that pushes the current round

Question 26

What is the unit for voltage?

Answer 26

Volt, V

Question 27

What is resistance?

Answer 27

Anything in the circuit which slows the flow down

Question 28

What is the unit for resistance?

Answer 28

Ohm

Question 29

Give one difference between thermistors and light dependent resistors

Answer 29

Thermistors are affected by temperature where’s LDR’s are affected by light intensity

Question 30

Give one similarity of thermistors and light dependent resistors

Answer 30

Both have a resistance that varies | Both are affected by external conditions

Question 31

What is the equation linking power, voltage and current?

Answer 31

Power = voltage x current