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AQA A-Level Physics
5. Electricity
5.3 Circuits
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Cards (93)
What are the three fundamental electrical quantities?
Current, potential difference, resistance
Potential difference is measured in
volts
.
True
What is the formula for Ohm's Law?
V
=
V =
V
=
I
R
IR
I
R
What are the three key electrical quantities?
Current, potential difference, resistance
Ohm's Law states that potential difference is directly proportional to
current
Electrical power is measured in
watts
.
True
What is the same through all elements in a series circuit?
Current
In a series circuit with resistors of 10 Ω and 20 Ω connected to a 12V supply, the current is
0.4 A
The total resistance in a parallel circuit is always less than the
smallest
individual resistance.
True
Arrange the steps to calculate current in a series circuit:
1️⃣ Calculate the total resistance
2️⃣ Use Ohm's Law to find the current
3️⃣ Substitute the values into the formula
The total resistance in a series circuit is the sum of individual
resistances
What happens to the current in a parallel circuit?
Current divides among branches
The potential difference is the same across all components in a
parallel circuit
.
True
Match the electrical quantity with its unit:
Current ↔️ Ampere
Potential Difference ↔️ Volt
Resistance ↔️ Ohm
Electrical power is calculated using the formula P =
VI
The total resistance in a series circuit is less than the smallest individual resistance.
False
The potential difference is distributed across components in a parallel circuit.
False
In a parallel circuit, the resistance is less than the smallest individual resistance because current flows through multiple
paths
The total resistance in a parallel circuit is less than the
smallest individual resistance
.
True
What is the current through a 20 Ω resistor in a parallel circuit connected to a 12 V supply?
0.6 A
In a parallel circuit, the potential difference is the same across all components.
True
What is the current through a 10 Ω resistor in a parallel circuit connected to a 12 V supply?
1.2 A
The total current in a
parallel circuit
is the sum of the currents through each branch.
True
How are series resistors combined to calculate equivalent resistance?
By adding their resistances
The equivalent resistance of two 20 Ω resistors in parallel is
10
Ω.
True
In a combination circuit, if R₃ = 30 Ω and R₂ = 20 Ω, what fraction of the total current flows through R₃?
20/50
What is the total resistance of two resistors in series with values 10 Ω and 20 Ω?
30 Ω
In a series circuit, the
current
is the same throughout the circuit.
True
What is the formula for calculating total resistance in a series circuit?
R_total = R₁ + R₂ + ... + Rₙ
In a parallel circuit, the total resistance is always less than the smallest individual
resistance
What is the formula for calculating total resistance in a parallel circuit?
1/R_total = 1/R₁ + 1/R₂ + ... + 1/Rₙ
The formula for calculating total resistance in a series circuit is R_total = R₁ + R₂ + ... + Rₙ
True
In parallel circuits, the total resistance is less than the smallest individual
resistance
What is the total resistance of two resistors in parallel with R₁ = 10 Ω and R₂ = 20 Ω?
6.67 Ω
What are the three key electrical quantities?
Current, voltage, resistance
Match the electrical quantity with its unit:
Current ↔️ Ampere
Potential Difference ↔️ Volt
Resistance ↔️ Ohm
What does Ohm's Law state?
V = IR
Electrical power is calculated using the formula P =
VI
In a series circuit, the
current
is the same through all elements.
True
In a parallel circuit, the
potential difference
is the same across all components.
True
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