2018 Year 9 Electricity Flashcards

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1
Q

What is the charge of a proton, neutron and electron?

A

Protons have a positive charge, Electrons have a negative charge and neutrons have no charge

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2
Q

If a charged particle has more electrons than protons, what will the charge be?

A

Negative

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3
Q

If a charged particle has more protons than electrons, what will the charge be?

A

Positive

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4
Q

What is the unit for current?

A

Amperes

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5
Q

What is the unit for voltage?

A

Volts

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6
Q

What is the unit for resistance?

A

Ohms

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7
Q

What is the name of the instrument used to measure voltage?

A

Voltmeter

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8
Q

What is the name of the instrument used to measure current?

A

Ammeter

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9
Q

What happens to the brightness of two light globes when placed in a series circuit?

A

The globes are duller than a globe in a basic circuit

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10
Q

What happens to the brightness of two light bulbs when they are placed in a parallel circuit?

A

The light bulbs are brighter in parallel than in series and would be the same as 1 lightbulb in a basic circuit

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11
Q

What is a transformer?

A

A transformer increases or reduces voltage

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12
Q

What is a generator?

A

A machine that uses electromagnetism to produce energy. It requires a coil and a magnet

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13
Q

What does the resistance of a wire depend on?

A

The material the wire is made of, the length of the wire and the thickness of the wire

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14
Q

What is an insulator? Give an example

A

An insulator is a material with such high resistance, electricity and heat is blocked from passing through completely. E.g. wood, air, water, brick,

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15
Q

What is the colour of the active wire in an electrical cable?

A

Brown

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16
Q

What is the colour of the neutral wire of an electrical cable?

A

Blue

17
Q

What is a fuse?

A

A fuse is a wire that will melts if too much current tries to pass through it

18
Q

What is a circuit breaker?

A

A switch that is activated by higher than normal current

19
Q

What is a residual current device?

A

A residual current device is used to detect current leaks. It stops any current from flowing if a leak is detected. It is also known as a safety switch

20
Q

What is a surge protector?

A

A device that turns off power to appliances if it detects massive and damaging increase in current

21
Q

What are the similarities and differences of static and current electricity?

A

Static electricity is the build up of charges. These charges stay in position until so much charge is built up that they jump across a gap as a spark or discharge to the air. Current electricity is the movement of charges, usually around the wires of a circuit

22
Q

State the voltage available from power point in Australia.

A

240 V

23
Q

Do power points supply AC or DC electricity?

A

AC

24
Q

When 3 batteries of 5V each are places in series, what is the total voltage?

A

15V

25
Q

What are the advantages of a parallel circuit over a series circuit?

A

Parallel circuits have one loop for each lightbulb. This means that unlike a series circuit, parallel circuits are independent of the others. If one light globe breaks in a series, they all stop working. If one breaks in a parallel, the rest keep working. Parallel circuits’ light bulbs shine brighter than series circuit because the electrons don’t need to go through multiple lightbulbs before going back to a power source

26
Q

What advantage does AC electricity have over DC electricity?

A

AC voltages can be changed into DC by using a rectifier. DC voltages can not.
AC can be increased or decreased using a transformer. DC voltages can not.
AC motors are relatively simple and more powerful than DC motors.
Transmission losses are lower in AC than DC.