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PAPER 1
PHYSICS: Electricity
RP: factors that affect resistance
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Keira m
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Cards (18)
What is the main topic of the practical experiment described in the study material?
Factors that affect
resistance
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What are the two types of electrical current mentioned?
Direct
and
alternating
current
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What is the unit of resistance?
Ohms
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What does potential difference measure in a circuit?
The energy given to the
charge carriers
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What is the formula to calculate resistance?
R
=
V/I
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If the potential difference is 10 V and the current is 2 A, what is the resistance?
R
=
R =
R
=
10
V
2
A
=
\frac{10 \text{ V}}{2 \text{ A}} =
2
A
10
V
=
5
Ω
5 \Omega
5Ω
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What is the aim of the experiment described in the study material?
To investigate how changing the
length
of the wire affects its
resistance
.
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What apparatus is used to measure electric current?
Ammeter
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What apparatus is used to measure potential difference?
Voltmeter
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How do you calculate resistance using voltage and current readings?
By using the formula
R
=
R =
R
=
V
I
\frac{V}{I}
I
V
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What is the relationship between the length of the wire and its resistance based on the experiment's results?
Resistance
increases as the length of the wire increases.
Resistance is directly
proportional
to length.
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What is the consequence of heating the resistance wire during the experiment?
Burns to the
skin
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What control measures should be taken to avoid burns from the resistance wire?
Do not touch the wire while the circuit is
connected
and allow it to
cool
.
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What does the graph of resistance against length indicate?
It shows that resistance is directly
proportional
to length.
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What is the potential difference measured in?
Volts
(V)
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What is the definition of electrical current?
Moving electric charges, such as
electrons
moving through a metal wire.
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What is the purpose of using crocodile clips in the experiment?
To connect the
resistance wire
at specified lengths.
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If the resistance of a wire is found to be 3 Ω at a length of 40 cm, what would you expect the resistance to be at 80 cm?
Approximately
6
Ω, since resistance is
directly proportional
to length.
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