Electrecity

Question 1

Cell

Answer 1

This has a store of chemical energy. The larger line shows the positive terminal and the short line shows the negative terminal

Question 2

Battery

Answer 2

2 or more cells joined together

Question 3

Switch

Answer 3

This sitches on and off, determining if the current is on or off

Question 4

Lamp

Answer 4

This lights and heats up when the current flows through it

Question 5

Variable resistor

Answer 5

This can vary the size of the current

Question 6

Fixed resistor

Answer 6

The value of the resistor affects the size of the current

Question 7

Voltmeter

Answer 7

Measures the potential difference

Question 8

Ammeter

Answer 8

Measures the current

Question 9

Motor

Answer 9

This rotates when the current flows

Question 10

Heater

Answer 10

is designed to transfer electric current into heat energy in the surrounding

Question 11

Diode

Answer 11

Allows current through in one direction only

Question 12

A light emittent diode( LED)

Answer 12

Emits light when a current passes through it

Question 13

A fuse

Answer 13

Designed to melt and therefore break the circuit if the current through it is a greater amount

Question 14

Triangle for charge flow( Q), current( I), time taken( t)

Answer 14

Q

I T

Question 15

What is charge measured in

Answer 15

Coulumbs( C)

Question 16

What is current measured in?

Answer 16

Amps(A)

Question 17

What is time taken measured in?

Answer 17

seconds

Question 18

When 2 insulators are rubbed together…

Answer 18

they become electrically charged

Question 19

What force allows electrons to move from one insulator to another

Answer 19

friction

Question 20

Electrons move when 2 insulators are rubbed together

Answer 20

because of friction and they are light and outside of the nucleus

Question 21

positive and positive

Answer 21

repel

Question 22

negative and negative

Answer 22

repel

Question 23

positive and negative or negative to positive

Answer 23

attract

Question 24

conductors and insulators are charged by

Answer 24

induction

Question 25

if charge is 240 and time is 2 min what will the current be

Answer 25

2A

Question 26

electrical resistance

Answer 26

is a measure of a components flow of current

Question 27

If the resistance of a variable resistance increases the current will...

Answer 27

decrease

Question 28

If the resistance of a variable resistance decreases the current will...

Answer 28

increase

Question 29

When was Ohm s law made

Answer 29

1927

Question 30

Ohm's law is the fundamentals of...

Answer 30

current, voltage resistance

Question 31

Ohm's law measures...

Answer 31

conductors

Question 32

the equation for voltage, current, and resistance

Answer 32

V=IR | Voltage= current*recistance

Question 33

Ohm's law

Answer 33

relationship between voltage current and recistance

Question 34

What is the full form of DC

Answer 34

direct current

Question 35

Full for of AC

Answer 35

alternative current

Question 36

DC

Answer 36

only flows in one direction

Question 37

AC

Answer 37

Changes directions periodically

Question 38

Reversing the potential difference across resistor reverses

Answer 38

the current through it

Question 39

Recistance in a Filament lamp

Answer 39

The line curves away from the y-axis. So the current is not directly proportional to the potential difference. It is a non- ohmic conductor the resistance of a metal increases as the temperature increases. Atoms vibrate more as temp. increases so they resist more from electrons passing Reversing the potential difference reverses the current and makes no difference to the shape of the curve. The resistance is the same for the same current, regardless of direction

Question 40

Resistance in a diode

Answer 40

Current flows in one direction only, called the forward direction Non- Ohmic conductor as the line curves toward the y- axis. Resistance is not directly proportional Forward resistance low; reverse resistance high also depends on which way it is connected

Question 41

Resistance in a Thermistor

Answer 41

Resistance decreases if the temperature increases | temperature-dependent resistor

Question 42

Resistance in LDR

Answer 42

temperature decreases if the light intensity increases

Question 43

Full form of LDR

Answer 43

Light-dependent resistor

Question 44

In a series circuit more resistors =

Answer 44

more resistance | R( on the leg T) = R( on the leg1)=R( on the leg of 2)...

Question 45

In a series circuit current=

Answer 45

same throughout circuit | I( on the leg T)= I( on the leg 1)= I( on the leg 2)

Question 46

In a series circuit, Voltage:

Answer 46

Voltage adds up | V( on the leg T)= V(on the leg 1)+V(on the leg 2)...

Question 47

R( on the leg T)=

Answer 47

R( on the leg eq)

Question 48

I( on the leg T)=

Answer 48

I( on the leg eq)

Question 49

V( on the leg T)=

Answer 49

V( on the leg eq)

Question 50

In a parallel circuit, total current=

Answer 50

the sum of the currents in separate branches | I( on the leg T)= I( on the leg 1)+ ( on the leg 2)...

Question 51

In a parallel circuit, potential difference across all branches

Answer 51

must have the same magnitude | V( on the leg T)= V( on the leg 1)= V( on the leg 2)= ( on the leg 3)...

Question 52

The reciprocal of the equivalent resistance is equal to ...

Answer 52

the sum of the reciprocal of the separate resistance parallel I/ R( on the leg T)=I/ R( on the leg 1)+ I/R( on the leg 2)