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Physics Yr11 > Yr12 > Flashcards

Yr12 Flashcards

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1
Q

How to calculate Current?

A

Time

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2
Q

What is Charge measured in?

A

Coulombs

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3
Q

How to calculate Charge?

A

Current x Time

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4
Q

What is Conventional Current?

A

Current that flows from positive to negative

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5
Q

What is Electron flow?

A

Current that flows from negative to positive

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6
Q

What is an electrical insulator?

A

An electrical insulator’s internal electrons don’t move freely and therefore can’t conduct current

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7
Q

How do you measure Current using an Ammeter?

A

You put the ammeter in series with what you are measuring

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8
Q

What does current do in a parallel circuit when it splits in to 2 paths?

A

The current splits in half

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9
Q

Does the current remain the same throughout a series circuit?

A

Yes

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10
Q

Does the current remain the same throughout a parallel circuit?

A

No

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11
Q

What is Voltage?

A

Similar to a push from a battery that makes a flow

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12
Q

What can voltage be alternatively named?

A

Potential Difference

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13
Q

How do you measure voltage using a Voltmeter?

A

Put in parallel with what you are measuring

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14
Q

What does Voltage do in a series circuit?

A

It splits across each resistor

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15
Q

How does voltage behave in a parallel circuit?

A

Voltage remains the same across each branch of the circuit

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16
Q

What happens to voltage when cells are added in Series?

A

It increases

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17
Q

What happens to voltage when cells are added in parallel?

A

Stays constant

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18
Q

What does Ohm’s Law State?

A

The current through a conductor is Directly Proportional to the Voltage across it provided the temperature is constant

19
Q

What is a Non-Ohmic resistor?

A

A conductor which does not give a straight line in a Voltage/Current graph

20
Q

How to calculate Voltage?

A

Voltage = Current x Resistance

21
Q

How to calculate resistance?

A

Resistance = Voltage
———
Current

22
Q

What is the definition of Resistance?

A

Resistance is the opposition of a conductor to a current

23
Q

What causes resistance?

A

The heating effect

24
Q

What is the heating effect?

A

When current flows through a resistance, electrons collide atoms. Electrons may then lose energy, and atoms gain it, and start vibrating. This creates heat.

25
Q

How does resistance behave if you place resistors on series?

A

Resistors act as one large resistor. Eg. 3 resistors in series = 1 large resistor

26
Q

How does resistance behave if you place resistors in parallel?

A

The inverse of the sum of the inverse of the resistances acts as one resistance. Eg. 1/R eff= 1/R + 1/R + 1/R
1/R eff= 1/3R
R eff = 1/ 1/3R
R eff = 3 R

27
Q

What is the definition of Electric Current?

A

Electric current is the rate of flow of charge

28
Q

How to calculate Power?

A

Power = Current x Voltage

29
Q

How to calculate Energy Changed?

A

Energy changed = Power (OR IxV) x Time

30
Q

How to calculate cost of energy?

A

Energy (kWh)= Power (kW) x Time (h)

Multiply this kWh by cost

31
Q

What is the function of the Earth wire in a plug?

A

A safety wire. If short circuit occurs, current flows down earth wire so that casing of plug doesn’t become live and electrocute someone

32
Q

What is the function of the fuse in a plug?

A

Designed to melt if too large a current flows through it, so as to protect appliance from catching fire

33
Q

What is the function of the Live wire in a plug?

A

Input to the device

34
Q

What is the function of the Neutral wire in a plug?

A

Output of the device

35
Q

What is Double Insulation?

A

This is for devices that don’t have earth wires. They are completely plastic so that casing can’t become live

36
Q

How do you know what fuse to use for your appliance?

A

Calculate what current usually flows through appliance. Choose fuse that melts when it is just above normal current

37
Q

What is a magnetic field?

A

This is the region around a magnet, where it has a magnetic effect

38
Q

What happens when a magnetic material is placed in a magnetic field?

A

It will experience a force

39
Q

Is a magnetic field created around a conductor when electric current flows through it? What is this called?

A

Yes, electromagnetism

40
Q

If a coil was wrapped around a magnet and current was conducted through it, how would you be able to tell the direction of the Magnetic Field and the Poles of the Magnet?

A

Right hand grip rule

41
Q

What is the right hand grip rule?

A

If you were holding on to a magnet wrapped in electric coil with your right hand, using your fingers to display the direction of current, your thumb will indicate the position of the North Pole

42
Q

What is the Motor Effect? Give a use of it?

A

A current carrying conductor in a magnetic field experiences a force. This is how electric motors work

43
Q

How to calculate energy? (Using Charge and Voltage)

A

Energy = Charge x Voltage

44
Q

How to calculate Power? (Using Current and Voltage)

A

Power = Current x Voltage

Physics Yr11 (4 decks)

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