Electricity

Question 1

What is electricity?

Answer 1

presence or flow of charged particles

Question 2

what is current?

Answer 2

flow of electrons from positive to negative

Question 3

what is potential difference?

Answer 3

driving force of charge.
without it there is no current in the circuit. eg. cells + batteries

Question 4

what is a cell?

Answer 4

supplies electricity (source of potential difference)

Question 5

what is a battery?

Answer 5

two or more cells joined together

Question 6

open + closed switch?

Answer 6

allows current to flow or not

Question 7

filament lamp (bulb)?

Answer 7

converts the electrical energy to light energy

Question 8

ammeter?

Answer 8

measures current in amps (a)

Question 9

voltmeter?

Answer 9

measures potential difference in volts (v)

Question 10

resistor?

Answer 10

reduces current flow. resistance remains the same. measured in ohms (Ω)

Question 11

variable resistor?

Answer 11

reduces current flow but can change resistance. increase/decrease

Question 12

fuse?

Answer 12

safety device that melts to break the circuit if current exceeds limit

Question 13

thermistor?

Answer 13

resistor that depends on temprature. high temp = low resistance low temp = high resistance

Question 14

LDR (light dependent resistor)?

Answer 14

resistor that depends on light intensity. high light intensity = low resistance low light intensity = high resistance

Question 15

Diode?

Answer 15

makes sure current flows in one direction

Question 16

LED (light emitting diode)

Answer 16

diode that emits light when current passes through it

Question 17

formula for charge?

Answer 17

charge (C) = time (s) x current (a)

Question 18

formula for potential difference?

Answer 18

potential difference (v) = current (a) x resistance (Ω)

Question 19

features of a series circuit?

Answer 19

components in a line, forming a loop
remove/disconnect one component circuit broken
very few thing connected this way

Question 20

features of a parallel circuit?

Answer 20

components joined by multiple branches
one component disconnected little effect on circuit because current can flow

Question 21

Which component does this graphs show?

Answer 21

filament lamp

Question 22

which component does this graph show?

Answer 22

diode

Question 23

which component does this graph show?

Answer 23

LDR (light dependent resistor)

Question 24

which component does this graph show?

Answer 24

thermistor

Question 25

what does this show?

Answer 25

resistors at constant temperatures