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Paper 1
Topic 2: Electricty
Calculating Energy Transfers by Components
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Cards (16)
What should you be able to calculate by the end of the video?
Total
energy transferred
by
components
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What is the relationship between charge flow and
energy transferred
in a circuit?
Charge flow indicates energy transfer in circuits
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How do you calculate total charge flowing in a circuit?
Charge =
Current
×
Time
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What is the current in the example circuit?
0.3
amp
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What is the total charge flowing in 10 seconds with a current of 0.3 amp?
3
kC
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What equation is used to calculate energy transferred in a circuit?
Energy
=
Charge
×
Potential difference
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What is the unit of energy transferred?
Joules
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If 4 kC of charge flows at 15 volts, what is the energy transferred?
60 J
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What must you calculate first to find energy transferred by resistor A?
Potential difference
across resistor A
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What is the potential difference across the cell in the example?
30
volts
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How is potential difference shared in series circuits?
It is shared across
components
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What is the potential difference across resistor A if resistor B has 25 volts?
5
volts
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How do you calculate the energy transferred by resistor A with 3 kC of charge and 5 volts?
Energy =
3
×
5
=
15
J
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What is the formula for energy transferred in a circuit?
Energy
(J) =
Charge
(C) ×
Potential Difference
(V)
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What are the steps to calculate total energy transferred by components?
Calculate total charge using
Charge
=
Current
×
Time
Use Energy = Charge ×
Potential Difference
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What are the key concepts in calculating energy transferred in circuits?
Current
(A)
Time
(s)
Charge
(C)
Potential Difference
(V)
Energy
(J)
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