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Harris Academy S3 Physics > Circuits > Flashcards

Circuits Flashcards

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1
Q

What is the name of this component?

A

Variable resistor

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2
Q

How many pencils are there?

A
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3
Q

What unit is resistance measured in?

A

Resistance is measured in ohms.

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4
Q

What is the name of this component?

A

Lamp

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5
Q

What unit is voltage measured in?

A

Voltage is measured in volts (V).

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6
Q

Describe how to use an ammeter to measure the current in a component.

A

An ammeter must be connected in series with a component.

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7
Q

What does the prefix k stand for?

A

k stands for kilo

kilo = x 103

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8
Q

Which quantity is represented by the symbol I?

A

I = current

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9
Q

Why does an L.E.D. always have a resistor connected in series with it?

A

An L.E.D. always has a resistor connected in series with it to protect the L.E.D.

The resistor will limit the current in the L.E.D.

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10
Q

Which quantity is represented by the symbol R?

A

R = resistance

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11
Q

What is the name of this component?

A

L.E.D. (light-emitting diode)

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12
Q

Which quantity is represented by the symbol V, in the equation shown ?

A

voltage

(or potential difference)

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13
Q

Round off this number to 3 significant figures.

1,526.33

A

1,526.33 rounded off to 3 significant figures is

1,530

(the ‘2’ has been rounded up to 3)

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14
Q

Round off this number to 3 significant figures.

3.14159

A

3.14159 rounded off to 3 significant figures is

3.14

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15
Q

What unit is current measured in?

A

Current is measured in amperes (A).

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16
Q

What is the name of this component?

A

L.D.R. (light-dependent resistor)

17
Q

What is the name of this component?

A

Cell

18
Q

Name as many different types of energy as possible.

A

Kinetic, potential, electrical, chemical, light, heat, sound, nuclear

19
Q

How could the resistance of a component be found from this graph?

A

The resistance could be found by

(a) calculating the gradient of the graph
(b) choosing a point on the graph and calculating voltage / current

20
Q

What does the prefix m stand for?

A

m stands for milli

milli = x 10-3

21
Q

What is the definition of current?

A

Current is how much electrical charge flows (past a point) in one second.

22
Q

What does a.c. stand for, and what does it mean?

A

a.c. stands for alternating current, which means the current changes direction every fraction of a second.

23
Q

How many types of electric charge are there, and what are their names?

A

There are two types of electric charge - positive and negative

24
Q

Describe how to use a voltmeter to measure the voltage across a component.

A

A voltmeter must be connected in parallel with a component.

25
Q

What is the name of this component?

A

Resistor

Harris Academy S3 Physics (4 decks)

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