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Physics session 2 part 1 > P5 > Flashcards

P5 Flashcards

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1
Q

Potential difference

A

Tells us how many joules per coulomb the component is taking out

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2
Q

Emf

A

The volts (joules per coulomb) being given to the circuit

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3
Q

Series

A

When components are placed one after another in the circuit

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4
Q

Parallel

A

When components are placed side by side. The current splits and goes to each component

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5
Q

Voltmeter

A

This is used to measure potential difference

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6
Q

Ammeter

A

This is used to measure current

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7
Q

Volume

A

How much space something takes up

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8
Q

Density

A

This is the mass of something divided by its volume

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9
Q

Equation for current

A

I=Q/t

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10
Q

Equation for voltage

A

Voltage=energy/charge

V=E/Q

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11
Q

Voltage unit of measurement

A

V

Volts

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12
Q

Energy unit of measurement

A

J

Joules

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13
Q

Charge

A

C

Coulombs

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14
Q

What do electrons carry

A

They carry energy and deliver this energy to the components in a circuit

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15
Q

Power

A

How much energy something uses every second.

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16
Q

Equation for power

A

P=E/t

Power=energy/ time

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17
Q

Watts

A

Joules per second

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18
Q

Current unit of measurement

A

A

Amps

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19
Q

Potential difference equation

A

Power=potential difference * current

P=VI

20
Q

Resistance

A

A measure of how much something resists (or tried to stop) an electric current flowing

21
Q

Resistance equation

A

Resistance=potential difference/ current

R=V/I

22
Q

Resistance unit of measurement

A

Ohms

23
Q

Characteristics for more resistance

A

Longer wire

Thinner wire

24
Q

Ohms law

A

The potential difference (voltage) across an ideal conductor is proportional to the current through it.

25
Q

Joule

A

The unit for energy

26
Q

Ohmmeter

A

Measures resistance

27
Q

Resistance in a series equation

A

R total= R1+R2+R3

28
Q

Resistance in a parallel circuit equation

A

1/R=1/R1+1/R2+1/R3

29
Q

Define electrostatic charge

A

When some materials become charged when they are rubbed. It is also known as “static electricity”.

30
Q

What is Perspex?

A

A type of positively charged rod. It is attracted to negatively charged rods. It gets its electrons pulled from the wool.

31
Q

What is Polythene?

A

A type of negatively charged rod. It is attracted to positively charged rods. It pulls electrons from the wool

32
Q

Good conductors of electricity

A

Metals, especially silver copper and aluminium. Carbon

33
Q

Semiconductors of electricity

A

Silicon and germanium

34
Q

Insulators of electricity

A

Plastics (PVC, Perspex, Polythene, etc.) Glass, rubber, dry air.

35
Q

Poor conductors of electricity

A

Water, human body, Earth.

36
Q

Define conductors

A

Materials that let electrons pass through them. Some of their electrons are loosely held to their atoms so they can pass freely between them (free electrons).

37
Q

Define insulators

A

Materials that hardly conduct at all. Their electrons are tightly held by atoms and are not free to move. They are easy to charge while rubbing because any electrons that get transferred tend to stay where they are.

38
Q

Define semiconductors

A

Poor conductors when cold, much better conductors when warm.

39
Q

Define Circuit Breaker

A

Safety device that stops current flowing if the current is too high.

40
Q

Define Fuse

A

A thin piece of wire (usually encased in a cartridge) that burns through or melts if too much current passes through it. A safety device.

41
Q

Define the live wire

A

The dangerous wire that is connected to the fuse. In Hong Kong it is brown.

42
Q

Define the neutral wire

A

The wire that completes the circuit. It is kept at 0 volts. IN Hong Kong it is blue.

43
Q

Define the Earth wire

A

The safety wire (not always present). It is a low resistance path to earth in case of accidents. In Hong Kong it is yellow and green.

44
Q

Coulomb

A

The unit for charge

45
Q

Volt

A

One joule per coulomb. It tells us how much energy each coulomb of charge has

46
Q

Ohm

A

The unit for resistance

Physics session 2 part 1 (1 decks)

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