Electricity

Question 1

What is charge measured in

Answer 1

Coulombs (C)

Question 2

What is general electron and proton charge labelled as

Answer 2

e (1.6x10^-19)

Question 3

What is a coulomb

Answer 3

The charge that passes a point in a circuit in one second when the current is 1 Amp

Question 4

Calculate the number of electrons in a single Coulomb of charge

Answer 4

1/e

Question 5

Define Current

Answer 5

The rate of flow of charge

Question 6

What is the equation for current

Answer 6

Q/t Charge/Time

Question 7

What is the unit for charge

Answer 7

Coulomb (C)

Question 8

What is the unit for current

Answer 8

Amperes (A)

Question 9

What is the alternative to Coulombs

Answer 9

Amp hours

Question 10

What are power bank and batteries usually labelled with unit

Answer 10

mAh (1000 mAh or 1Ah)

Question 11

What is 1Ah in Coulombs

Answer 11

3600 Coulombs (1x60x60)

Question 12

What is the gradient of a charge-time graph

Answer 12

Current

Question 13

What is the area below a Current-time graph

Answer 13

Charge

Question 14

Why do some metals conduct

Answer 14

Delocalised electrons

Question 15

What is the formula for electron Drift

Answer 15

I = nAve

Question 16

What is n in the electron drift equation

Answer 16

The number of electrons in a volume

Question 17

What does A stand for in the Electron Drift equation

Answer 17

Area of cross section

Question 18

What does v stand for in the electron drift equation

Answer 18

Velocity

Question 19

What does e stand for in the Electron drift equation

Answer 19

Electron Charge or 1.6x10^-19

Question 20

What is potential difference

Answer 20

It is the amount of work done per unit charge

Question 21

What is the equation for potential difference

Answer 21

V=W/Q or Voltage = work done/ charge

Question 22

What is power

Answer 22

Power is the rate of transfer of energy

Question 23

What is the equation for power

Answer 23

p=w/t Power = energy transferred / time

Question 24

How many Joules per second does a 60 watt lamp deliver

Answer 24

60J

Question 25

If a TV has a mains PD of 230V and current of 0.2A, what wattage does it give out (P = IV)

Answer 25

230x0.2 = 46W

Question 26

Define resistance

Answer 26

The restriction of flow of charge

Question 27

What is the equation involving resistance

Answer 27

V=IR and flip it any way you want

Question 28

What is resistance measured in

Answer 28

Ohms

Question 29

Why does resistance happen

Answer 29

Collision of electrons and ions as they flow which makes them lose kinetic energy

Question 30

What happens when you heat metals

Answer 30

Hotter atoms vibrate, which increases collisions and increases resistance

Question 31

What is a superconductor

Answer 31

A material that has 0 resistance

Question 32

What does Super Conduction mean to a current

Answer 32

It allows current to flow in a wire without applying any potential difference