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Science grade 9 exam cards > unit 2 > Flashcards

unit 2 Flashcards

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1
Q

Ammeter

A

measures electric current, measured in amperes

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2
Q

Battery

A

connection of two or more cells

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3
Q

charge(Q)

A

electric charge passing through a point in a circuit based on a very large number (6.25x1018)

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4
Q

Electrostatic Series

A

a list of materials that have been arranged according to their ability to hold on to electrons

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5
Q

Insulator

A

do not allow charges to flow through them and can have static electricity

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6
Q

Conductor

A

allow charges to move freely through them and cannot have static electricity

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7
Q

Negative charge

A

the type of electrical charge that can be rubbed off a material

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8
Q

Positive charge

A

the type of electrical charge that are left behind when negative charges are rubbed off a material

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9
Q

Charging by friction

A

the process of charging materials by rubbing

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10
Q

Static electricity

A

an electric charge that tends to stay on the surface of an object, rather than flowing away quickly

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11
Q

Electroscope

A

a device for detecting the presence of an electric charge

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12
Q

Charging by contact

A

generating a charge on a neutral object by touching it with a charged object

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13
Q

Laws of electric charges

A

laws that describe how two objects interact electrically when one or both are charged

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14
Q

Circuit

A

a controlled path through which electric current(or electrons) can flow

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15
Q

Potential difference(V)

A

the change in energy of a unit of charge after passing through a source or load

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16
Q

Load

A

anything that converts electrical energy to a form of energy that can be used

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17
Q

Resistance(R)

A

the quantity that describes the hindering by a load. It will resist the flow of the current

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18
Q

Series circuit

A

one path for electrons

19
Q

Parallel circuit

A

more than one path for electrons

20
Q

Current

A

charge moving past a point

21
Q

Current electricity

A

rate of movement of electric charges. Also known as the amount of charge that passes through a point in a wire every second

22
Q

Voltmeter

A

measures the amount of energy each group of electrons has when moving through a circuit

23
Q

OHM’s law

A

the ratio of potential difference to current is a constant called resistance

24
Q

Energy

A

a form of energy resulting from the flow of charged particles, such as an electron, through a conductor.

25
Q

Charging by induction

A

charging an object without actually touching the object to any other charged object

26
Q

Positive + Positive = ??

A

repel

27
Q

Negative + Neutral = ??

A

attract

28
Q

Negative + Positive = ??

A

attract

29
Q

Neutral + Neutral = ??

A

nothing

30
Q

Explain what happens when charged ebonite rod is brought near: Small pieces of paper

A

The pieces of paper will stick to the rod

31
Q

Explain what happens when charged ebonite rod is brought near: Another charged ebonite rod

A

The rods will repel from each other

32
Q

Explain what happens when charged ebonite rod is brought near: fur with an opposite charge

A

The charge on the rod will transfer to the fur

33
Q

Explain what happens when charged ebonite rod is brought near: A neutral pith ball

A

The rod with attract with the pith ball

34
Q

What is the formula of electric current?
What is it measured in?

A

current = charge moving past a point/time
Measured in amperes
I = Q/T

35
Q

What is the formula of potential difference?
What is it measured in?

A

potential energy = energy/charge
measured in volts
V = E/Q

36
Q

What is the formula of resistance?
What is it measured in?

A

Resistance = potential difference/ current
measured in ohms (Ω)
R = V/I

37
Q

What is the function of a battery

A

source of current

38
Q

What is the function of a switch

A

make or break the circuit

39
Q

What is the function of an ammeter

A

measures current (amperes)

40
Q

What is the function of a voltmeter

A

measures voltages (volts)

41
Q

What is the function of a light bulb

A

converts energy into light energy

42
Q

How would you calculate energy efficiency?

A

To calculate energy efficiency, you divide the useful energy output by the total energy input, then multiple by 100 to get a percentage. For example, if a light bulb converts 20% of the electrical energy into light and the rest into heat, its energy efficiency is 20%

43
Q

How would you calculate the cost of electricity?

A

To calculate the cost of electricity, you multiply the power of the appliance in kilowatts (kw) by the time it’s used in hours (h), and then multiply by the cost per kilowatt-hour (kwh) from your electricity bill.

Science grade 9 exam cards (4 decks)

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