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Physics > ELECTRICITY > Flashcards

ELECTRICITY Flashcards

1
Q

WHATS AN ELECTRIC CURRENT?

A

Flow of electrical charge

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2
Q

WHAT IS AN ELECTRICAL CHARGE?

A

Only flows through a closed circuit if there’s a potential difference

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3
Q

WHAT IS A SINGLE CLOSED LOOP?

A

Same value everywhere in the circuit

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4
Q

WHAT DOES POTENTIAL DIFFERENCE DO?

A

Pushes charge round

The unit is volts

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5
Q

WHAT IS RESISTANCE?

A

Slows the flow down

Unit is Ohms

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6
Q

WHAT DOES THE CURRENT DEPEND ON

A

The potential difference and resistance

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7
Q

THE GREATER THE RESISTANCE…

A

The small the current flows

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8
Q

WHAT IS CURRENT?

A

Rate of the flow of the charge

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9
Q

WHAT IS THE EQUATION FOR MEASURING THE CHARGE FLOW

A

Q=IT

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10
Q

WHAT IS THE SYMBOL FOR AN LED

A

V

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11
Q

WHAT IS THIS SYMBOL?

A

A variable resistor

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12
Q

IS THIS THE SYMBOL FOR A FUSE, THERMISTOR OR RESISTOR?

A

Thermostat

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13
Q

WHICH OF THESE SYMBOLS IS A DIODE, LDR AND LED?

A

H

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14
Q

WHAT IS THE EQUATION FOR WORKING OUT THE POTENTIAL DIFFERENCE?

A

V=IR

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15
Q

WHAT DOES THE RESISTANCE OF A CIRCUIT DEPEND ON

A

Many factors like the type of circuit, length of the wire, etc

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16
Q

WHAT DOES AN AMMETER DO?

A

Measure the current flowing through the test wire in amps

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17
Q

WHAT SOES A VOLT METER DO?

A

Measures the potential difference across the wire

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18
Q

WHERE IS THE AMMETER PLACES IN A CIRCUIT?

A

In series with whatever you’re investigating

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19
Q

WHERE IS A VOLTMETER PLACED IN A CIRCUIT?

A

Placed in parallel to whatever you’re investigating

20
Q

WHAT IS RESISTANCE?

A

Anything in the circuit which reduces the flow of the current

21
Q

WHAT DETERMINES THE CURRENT FLOWING THROUGH A CURRENT?

A

Resistance of and potential difference across a component

22
Q

WHAT DOES AN OHMIC CONDUCTOR HAVE?

A

A constant resistance eg wire

23
Q

WHEN IS THE CURRENT FLOWING THEOUGH AN OUMIC CONDUCTOR PROPORTIONAL TO THE POTENTIAL DIFFERENCE ACROSS IT?

A

At a constant temperature

24
Q

WHAT DOES IT MEAN WHEN COMPONENTS ARENT OHMNIC?

A

Their resistance changes with the current through them, eg diodes and lamps

25
Q

WHAT IS AN I-V CHARACTERISTIC?

A

How the current varies as you change the potential difference across a component

26
Q

WHAT I-V CHARACTERISTICS HAS LINEAR COMPONENTS?

A

OHMNIC conductors as the resistance stays the same

27
Q

WHY DOES A NON LINEAR COMPONENT HAVE A CURVED I-V CHARACTERISTIC?

A

The resistance changes depending on the current

28
Q

WHAT IS A FILAMENT LAMP?

A

It transfers some energy into thermal

29
Q

WHEN DOESNR RESISTANCE INCREASE WITH A FILAMENT LAMP?

A

It increases with the temperature as more current flows, the resistance increases

30
Q

WHERE DOES THE CURRENT FLOW THROUGH A DIODE

A

In one direction

31
Q

WHAT DOES RESISTANCE DEPEND ON WITH A DIODE?

A

The direction of the current

32
Q

WHAT DOES A GRAPH LOOK LIKE WITH A FIXÉD RESISTOR?

A

Gsjfvv

33
Q

WHAT DOES A GRAPH LOOK LIKE WITH A FILAMENT LAMP?

A

Dbevcvev

34
Q

WHAT DOES A GRAPH LOOK LIKE WITH A DIODE?

A

Shdvgdh

35
Q

WHAT IS LDR?

A

Light Dependent Resistor that detects light levels

Rosi stances decreases—> light intensity increases

36
Q

WHAT IS LED?

A

It’s a diode that glows when electricity passes in one direction

37
Q

WHAT DOES THIS DISGRAM DO?

A

Turns on when dark

Used in street lamps, flash on camera, brightness on screens, etc

38
Q

WHAT DOES THIS DIAMGRAM DO?

A

Turns on when there’s light

39
Q

WHATS A THERMISTOR?

A

It’s like LDR but works with heat

Used in central heating

40
Q

LABEL HIS DIAGRAM?

A 
A earth wire
B outer flexible insulation
C live fuse wire
D cord grip 
E Neutral wire
41
Q

WHATS A FUSE?

A

Melts when a currents too high

42
Q

WHAT ARE THE TYPES OF FUSES?

A

1A, 3A,5A,13A

43
Q

WHAT ARE CURRENT BREAKERS?

A

Electronic fuses that reset easily

44
Q

WHAT DOES RCCB STAND FOR?

A

Residual Current Breakers

45
Q

WHAT DOES AN RCCB DO?

A

Ministers current in live and neutral wires

If there’s a difference it cuts the current immediately preventing electricution

46
Q

WHAT IS THE NATIONAL GRID

A

Network of cable & transformers that convert power stations to home & factories

47
Q

WHY IS ELECTRICITY IS TRANSMITTED AT A VERY HIGH VOLTAGE BY THE NATIONAL GRID?

A

To minimise energy lost

Physics (3 decks)

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