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N5 Physics > Electricity and Energy > Flashcards

Electricity and Energy Flashcards

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1
Q

What is the formula to calculate charge?

A

Charge = current x time

Q=It

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2
Q

What direction does charge flow in a DC circuit?

A

One direction from negative to positive terminal

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3
Q

What direction does charge flow in an AC circuit?

A

Constantly changes direction

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4
Q

What is the equation for ohms law?

A

Voltage = current x resistance

V=IR

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5
Q

What is resistance (R) measured in?

A

Ohms

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6
Q

What is current (I) measured in?

A

Amperes (A)

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7
Q

What is an electric field?

A

An area which charged particles experience a force or attraction or repulsion

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8
Q

What happens when the lines of an electric field are closer together?

A

The field is stronger

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9
Q

Which way does a positive charge force go?

A

outwards

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10
Q

Which was does a negative charge force go?

A

Inwards

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11
Q

What are the rules for series circuit?

A

Current is the same everywhere

Voltage is split between components

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12
Q

What are the rules for parallel circuits?

A

Current is split between components

Voltage is the same everywhere

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13
Q

What is the rule for series resistance?

A

Rt= R1+R2…

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14
Q

What is the rule for parallel resistance?

A

1/Rt = 1/R1 + 1/R2…

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15
Q

What is a LED?

A

An electronic component that can produce light

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16
Q

Why must a LED always be connected to a resistor?

A

To protect the bulb from blowing up

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17
Q

What does MOSFET stand for?

A

Metal oxide semiconductor field effect transistor

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18
Q

What are the names for the three MOSFET terminals?

A

The gate, source and drain

19
Q

What are the names for the three NPN transistor terminals?

A

The base, collector and emitter

20
Q

When is the NPN transistor on?

A

When the input voltage is greater than or equal to 0.7V at the base

21
Q

When is the MOSFET on?

A

When the input voltage is greater than or equal to 2V at the gate

22
Q

What is power?

A

The rate at which energy is transferred

23
Q

What is the equation for power?

A

Power = energy / time

P=E/t

24
Q

What is power (P) measured in?

A

Watts (W)

25
Q

What is energy measured in?

A

Joules (J)

26
Q

What is a fuse?

A

A device which melts if the current in the circuit is too high it breaks the circuit and cuts the power supply

27
Q

What is the equation to work out specific heat capacity?

A

Eh= cm/\T

28
Q

What is the specific latent heat of a substance?

A

The amount of energy required it change the state of 1kg of a material

29
Q

What is specific latent heat of fusion?

A

Solid to liquid

30
Q

What is specific latent heat of vaporisation?

A

Liquid to gas

31
Q

What is the equation to calculate specific latent heat?

A

Eh= ml

32
Q

What is pressure?

A

The force per unit area

33
Q

What is the formula for pressure?

A

Pressure= Force / Area

P=F/A

34
Q

What is pressure (P) measured in?

A

Pascals (Pa)

35
Q

What is force (F) measured in?

A

Newton’s (N)

36
Q

What is the formula for Boyle’s Law?

A

P1V1 = P2V2

37
Q

What is 0°C in kelvin?

A

273k

38
Q

If temperature rises 1°C, what does it rise in kelvin?

A

1k

39
Q

What is the formula for the pressure law?

A

P1/T1 = P2/T2

40
Q

What is the formula for Charles’ law?

A

V1/T1 = V2/T2

41
Q

What is work done?

A

The transfer of energy

42
Q

What is the formula to calculate work done?

A

Word done = force x distance

Ew = Fd

43
Q

What is the formula for gravitational potential energy?

A

Ep = mgh

44
Q

What is the formula for kinetic energy?

A

Ek = 1/2mv2

N5 Physics (3 decks)

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