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AP Physics C: Electricity and Magnetism
Unit 11: Electric Circuits
11.7 Kirchhoff's Junction Rule
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What does Kirchhoff's Junction Rule state about currents at a junction?
Sum of currents in equals sum of currents out
A junction in an electric circuit is a point where three or more
conductors
meet.
What are the key aspects of a junction in an electric circuit?
Intersection of three or more conductors
What is the mathematical statement of Kirchhoff's Junction Rule?
\Sigma I_{in} = \Sigma I_{out}</latex>
Kirchhoff's Junction Rule ensures that charge is neither created nor
destroyed
In the example, current I_4 is found to be
5A
Match the key concept with its description:
Kirchhoff's Junction Rule ↔️ Sum of currents entering equals leaving
Conservation of Charge ↔️ Charge is neither created nor destroyed
At a junction, currents split or
merge
Kirchhoff's Junction Rule reflects the conservation of charge in electric circuits.
True
The mathematical statement of Kirchhoff's Junction Rule is
Σ
I
∈
=
\Sigma I_{\in} =
Σ
I
∈
=
Σ
I
o
u
t
\Sigma I_{out}
Σ
I
o
u
t
.
True
Kirchhoff's Junction Rule is based on the
conservation of charge
principle.
True
Kirchhoff's Junction Rule focuses on the
conservation
of charge at a junction.
True
Kirchhoff's Junction Rule reflects the principle of
conservation of charge
.
True
A junction is a point where three or more conductors meet, allowing currents to split or
combine
Kirchhoff's Junction Rule mathematically states that the sum of currents entering a junction equals the sum of currents
leaving
When applying Kirchhoff's Junction Rule, you must first identify the junction in the
circuit
.
True
If currents I1 = 3A and I2 = 4A enter a junction and I3 = 2A leaves, then I4 = 5A also leaves the junction.
True
Kirchhoff's Junction Rule is based on the conservation of
charge
Ohm's Law relates voltage, current, and resistance using the formula
V = IR
Kirchhoff's Junction Rule states that the sum of incoming currents equals the sum of outgoing currents at a
junction
What is the formula for Kirchhoff's Junction Rule?
\Sigma I_{in} = \Sigma I_{out}</latex>
Junctions are vital for applying
Kirchhoff's
Junction Rule in circuit analysis.
True
What does
Σ
I
∈
\Sigma I_{\in}
Σ
I
∈
represent in Kirchhoff's Junction Rule?
Sum of incoming currents
The principle underlying Kirchhoff's Junction Rule is the conservation of
charge
What is the first step in applying Kirchhoff's Junction Rule?
Identify the junction
What does Kirchhoff's Loop Rule state about voltage drops around a closed loop?
The sum is zero
Match the concept with its description:
Junction ↔️ Point where conductors meet
Kirchhoff's Junction Rule ↔️ Conservation of charge
Current Behavior ↔️ Split or merge currents
Application ↔️ Analyzes current distribution
Currents in a junction ensure the
conservation of charge
.
True
Kirchhoff's Junction Rule is also known as
Kirchhoff's First Law
.
True
In Kirchhoff's Junction Rule, the equation to set up is Σ I_in = Σ
I_out
Kirchhoff's Junction Rule states that the sum of incoming currents equals the sum of outgoing
currents
In a parallel circuit with resistors R1 = 10Ω and R2 = 15Ω, connected to a 12V source, the current through R1 is
1.2A
.
True
What is the formula for Ohm's Law?
V
=
V =
V
=
I
R
IR
I
R
What is the current through a 15Ω resistor connected to a 12V source?
0.8A
Steps to solve complex circuit problems using Kirchhoff's Junction Rule
1️⃣ Identify the Junction
2️⃣ Label the Currents
3️⃣ Apply Kirchhoff's Junction Rule
4️⃣ Solve for Unknown Current
Kirchhoff's Junction Rule is based on the conservation of charge.
True
Kirchhoff's Junction Rule applies only to currents in DC circuits.
False
What is a junction in an electric circuit?
Three or more conductors meet
The sum of currents entering a junction is equal to the sum of currents
leaving
What are the key components that define a junction in an electric circuit?
Conductors, currents, Kirchhoff's Junction Rule
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