WorksheetsKirchhoff's Rules and Circuits
Total questions: 20
Worksheet time: 25mins
Assume that the voltage of the battery is 9 V and that the three resistors are identical. What is the potential difference across each resistor?
12 V
0 V
3 V
4 V
In the circuit below, what is the voltage across R1?
12 V
6 V
8 V
4 V
What is the current through R1?
10 A
5 A
7 A
2 A
Points P and Q are connected to a battery of fixed voltage. As more resistors R are added to the parallel circuit, what happens to the total current in the circuit?
increases
remains the same
decreases
drops to zero
Current flows through a lightbulb. If a wire is now connected across the bulb, what happens?
all the current continues to flow through the bulb
half the current flows through the wire, the other half continues through the bulb
all the current flows through the wire
none of the above
Two lightbulbs A and B are connected in series to a constant voltage source. When a wire is connected across B, bulb A will:
glow brighter than before
glow just the same as before
glow dimmer than before
go out completely
The lightbulbs in the circuit below are identical with the same resistance R. Which circuit produces more light? (brightness ÜÞ power)
circuit 1
circuit 2
both the same
it depends on R
The three lightbulbs in the circuit all have the same resistance of 1 W . By how much is the brightness of bulb B greater or smaller than the brightness of bulb A? (brightness <=> power)
twice as much
1/2 as much
1/4 as much
4 times as much
What happens to the voltage across the resistor R1 when the switch is closed? The voltage will:
increases
decreases
remains the same
What happens to the voltage across the resistor R4 when the switch is closed?
increases
decreases
stays the same
Which resistor has the greatest current going through it? Assume that all the resistors are equal.
R1
both R1 and R2 equally
R3 and R4
R5
What is the current in branch P?
2 A
3 A
5 A
6 A
10 A
The lightbulbs in the circuit are identical. When the switch is closed, what happens?
both bulbs go out
intensity of both bulbs increases
intensity of both bulbs decreases
A gets brighter and B gets dimmer
nothing changes
Which of the equations is valid for the circuit below?
2 – I1 – 2I2 = 0
2 – 2I1 – 2I2 – 4I3 = 0
2 – I1 – 4 – 2I2 = 0
I3 – 4 – 2I2 + 6 = 0
2 – I1 – 3I3 – 6 = 0
What is the loop rule for the outside loop?
8 V - I3(4) + I1(1) = 0
4 V - I3(4) + I1(1) = 0
8 V - I3(4) - I1(1) = 0
4 V - I3(2) + I1(1) = 0
Kirchhoff's junction rule is a statement of ______
the law of conservation of momentum.
the law of conservation of energy.
the law of conservation of charge.
the law of ohms.
Kirchhoff's loop rule is a statement of _____.
the law of conservation of momentum.
the law of conservation of charge.
the law of conservation of energy.
the law of conservation of ohms.
A battery has an emf ε = 43.0 V and an internal resistance r = 8.0 Ω, as shown in the figure. When the terminal voltage Vab is equal to 34.0 V, the current through the battery, including its direction, is closest to ___
1.1 A, from b to a.
4.2 A, from b to a.
1.1 A, from a to b.
4.2 A, from a to b.
5.4 A, from a to b.
A battery has an emf ε = 12 V and an internal resistance r = 2.0 Ω, as shown in the figure. When a 3.0-Ω cable is connected across the battery terminals a and b, the rate at which chemical energy in the battery is depleted is closest to
24 W
27 W
29 W
32 W
34 W
A battery with an emf of 15 V and an internal resistance of 3 ohms is connected to a circuit with a resistor be varied from ohms to 6 ohms. If the resistor is increased from 3 ohms to 6 ohms, what happens the terminal voltage across the battery as the resistor increases?
The terminal voltage increases.
The terminal voltage decreases.
The terminal voltage remains the same.
