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Edexcel GCSE Physics
Topic 10: Electricity and Circuits
10.2 Current, Voltage, and Resistance
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Ohm's Law describes the relationship between current,
voltage
, and resistance.
True
What is the unit of measurement for voltage?
Volts
What is the equation to calculate current?
I
=
I =
I
=
Q
t
\frac{Q}{t}
t
Q
Ohm's Law states that voltage is directly proportional to current if resistance is constant.
True
What is the formula to calculate current using Ohm's Law?
I
=
I =
I
=
V
R
\frac{V}{R}
R
V
Ohm's Law states that voltage across a conductor is inversely proportional to the current flowing through it.
False
The current in Ohm's Law is measured in amperes.
True
The current in Ohm's Law is the rate of flow of electric charge.
True
What is the rearranged equation to calculate current using Ohm's Law?
I = \frac{V}{R}</latex>
Match the Ohm's Law variable with its definition:
Voltage ↔️ Potential difference driving current
Current ↔️ Rate of flow of electric charge
Resistance ↔️ Opposition to current flow
What is the equation to calculate resistance using Ohm's Law?
R
=
R =
R
=
V
I
\frac{V}{I}
I
V
What are the three main factors affecting resistance in a conductor?
Length, area, material
What equation relates current, charge, and time?
I = \frac{Q}{t}</latex>
Voltage is the electrical energy needed to move a unit
charge
Current is measured in
amperes
Match the term with its definition:
Current ↔️ Rate of flow of charge
Voltage ↔️ Potential difference driving current
Resistance ↔️ Opposition to current flow
What is the equation for calculating resistance?
R
=
R =
R
=
V
I
\frac{V}{I}
I
V
What is the unit of measurement for resistance?
Ohms
What is the equation for voltage if energy and charge are known?
V
=
V =
V
=
W
Q
\frac{W}{Q}
Q
W
V
V
V
in Ohm's Law represents the voltage
V
V
V
in Ohm's Law is measured in volts
Steps to calculate current using Ohm's Law
1️⃣ Start with the equation
V
=
V =
V
=
I
R
IR
I
R
2️⃣ Rearrange the equation to
I
=
I =
I
=
V
R
\frac{V}{R}
R
V
3️⃣ Substitute the values of
V
V
V
and
R
R
R
4️⃣ Calculate the value of
I
I
I
The current in a circuit with 12V and
4Ω
is 3A.
True
The voltage in a circuit with 2A and 10Ω is 20V.
True
The resistance in a circuit with 12V and 3A is 4Ω.
True
Doubling the cross-sectional area of a conductor doubles its resistance.
False
Current is the rate of flow of electric
charge
Resistance is the opposition to the flow of electric
current
The equation for Ohm's Law is
V = IR
The formula to calculate current using Ohm's Law is
I
=
I =
I
=
V
R
\frac{V}{R}
R
V
.
True
What is the voltage in a circuit with a current of 2A and a resistance of 10Ω?
20V
V
=
V =
V
=
I
R
IR
I
R
is used to solve for R
What is the unit of resistance?
Ohms (Ω)
Current is the rate of flow of electric charge measured in amperes.
True
The resistance of a conductor is inversely proportional to its
area
A power source in a circuit provides electrical
energy
In a circuit diagram, a
light bulb
is represented by a specific symbol.
True
The load in a circuit diagram consumes electrical energy.
True
A power source in a circuit provides the electrical
energy
Connecting wires in a circuit diagram are represented by straight
lines
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