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Yr9 Physics > Electrecity > Flashcards

Electrecity Flashcards

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1
Q

Cell

A

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

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2
Q

Battery

A

2 or more cells joined together

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3
Q

Switch

A

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

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4
Q

Lamp

A

This lights and heats up when the current flows through it

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5
Q

Variable resistor

A

This can vary the size of the current

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6
Q

Fixed resistor

A

The value of the resistor affects the size of the current

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7
Q

Voltmeter

A

Measures the potential difference

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8
Q

Ammeter

A

Measures the current

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9
Q

Motor

A

This rotates when the current flows

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10
Q

Heater

A

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

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11
Q

Diode

A

Allows current through in one direction only

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12
Q

A light emittent diode( LED)

A

Emits light when a current passes through it

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13
Q

A fuse

A

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

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14
Q

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

A

Q

I T

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15
Q

What is charge measured in

A

Coulumbs( C)

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16
Q

What is current measured in?

A

Amps(A)

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17
Q

What is time taken measured in?

A

seconds

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18
Q

When 2 insulators are rubbed together…

A

they become electrically charged

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19
Q

What force allows electrons to move from one insulator to another

A

friction

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20
Q

Electrons move when 2 insulators are rubbed together

A

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

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21
Q

positive and positive

A

repel

22
Q

negative and negative

A

repel

23
Q

positive and negative or negative to positive

A

attract

24
Q

conductors and insulators are charged by

A

induction

25
Q

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

A

2A

26
Q

electrical resistance

A

is a measure of a components flow of current

27
Q

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

A

decrease

28
Q

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

A

increase

29
Q

When was Ohm s law made

A

1927

30
Q

Ohm’s law is the fundamentals of…

A

current, voltage resistance

31
Q

Ohm’s law measures…

A

conductors

32
Q

the equation for voltage, current, and resistance

A

V=IR

Voltage= current*recistance

33
Q

Ohm’s law

A

relationship between voltage current and recistance

34
Q

What is the full form of DC

A

direct current

35
Q

Full for of AC

A

alternative current

36
Q

DC

A

only flows in one direction

37
Q

AC

A

Changes directions periodically

38
Q

Reversing the potential difference across resistor reverses

A

the current through it

39
Q

Recistance in a Filament lamp

A

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

40
Q

Resistance in a diode

A

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

41
Q

Resistance in a Thermistor

A

Resistance decreases if the temperature increases

temperature-dependent resistor

42
Q

Resistance in LDR

A

temperature decreases if the light intensity increases

43
Q

Full form of LDR

A

Light-dependent resistor

44
Q

In a series circuit more resistors =

A

more resistance

R( on the leg T) = R( on the leg1)=R( on the leg of 2)…

45
Q

In a series circuit current=

A

same throughout circuit

I( on the leg T)= I( on the leg 1)= I( on the leg 2)

46
Q

In a series circuit, Voltage:

A

Voltage adds up

V( on the leg T)= V(on the leg 1)+V(on the leg 2)…

47
Q

R( on the leg T)=

A

R( on the leg eq)

48
Q

I( on the leg T)=

A

I( on the leg eq)

49
Q

V( on the leg T)=

A

V( on the leg eq)

50
Q

In a parallel circuit, total current=

A

the sum of the currents in separate branches

I( on the leg T)= I( on the leg 1)+ ( on the leg 2)…

51
Q

In a parallel circuit, potential difference across all branches

A

must have the same magnitude

V( on the leg T)= V( on the leg 1)= V( on the leg 2)= ( on the leg 3)…

52
Q

The reciprocal of the equivalent resistance is equal to …

A

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)

Yr9 Physics (8 decks)

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