WorksheetsPhysics Quiz on Electricity
Total questions: 20
Worksheet time: 10mins
What is the drift velocity of electrons in a conductor related to?
Electric current and cross-sectional area
Resistance and voltage
Power and resistance
Capacitance and charge
Which of the following best describes Ohm's Law?
I∝R
R=I
V∝I (if temperature is constant)
P∝V
For a conductor with resistance R, what happens to the current if the voltage across it is doubled?
Halves
Doubles
Increases four times
No change
The total resistance of a circuit with resistors R1 and R2 in parallel is:
Rtotal=R1+R2
Rtotal=1/R1+R2
Rtotal=R1R2/(R1+R2)
Rtotal=R2R1
A resistor is rated as 100Ω±5%. What is the range of possible resistance?
90Ω to 105Ω
95Ω to 105Ω
95Ω to 100Ω
90Ω to 110Ω
The power dissipated in a resistor is given by which of the following?
P=I^2R
P=V^2/R
P=VI
All of the above
A cell has an internal resistance of r. When connected to an external resistor R, the terminal voltage is:
V=IR
V=I(R+r)
V=EMF−Ir
V=EMF/(R+r)
Kirchhoff’s voltage law (KVL) is based on:
Conservation of energy
Conservation of charge
Conservation of current
Conservation of resistance
For a wire of resistivity ρ, length L, and cross-sectional area A, the resistance is given by:
R=ρA/L
R=ρAL
R=ρL/A
R=ρA/L
The charge flowing through a wire in 10 seconds is 50C. What is the current?
2A
5A
10A
50A
A 60 W, 240 V lamp is connected to a 120 V supply. What happens to the power output?
Becomes 30W
Remains 60W
Becomes 15W
Becomes 120W
A circuit with two identical cells in series is connected to a resistor. If one cell is reversed, the terminal voltage is:
Doubled
Halved
Zero
Unchanged
In a parallel circuit with two branches, the branch with higher resistance will:
Have higher current
Have lower current
Have the same current as the other branch
Be unaffected by resistance
What is the equivalent resistance of three 10Ω resistors in series?
10Ω
20Ω
30Ω
3.3Ω
The emf of a cell is 12 V and its internal resistance is 2 Ω. When connected to a 4 Ω resistor, the terminal voltage is:
12V
8V
4V
6V
If the current in a circuit is doubled, the power dissipated in a resistor:
Doubles
Halves
Quadruples
Remains constant
A wire is stretched to double its original length. What happens to its resistance?
Halves
Doubles
Quadruples
Remains constant
A potentiometer measures emf because:
No current flows through the galvanometer when balanced
The resistance is zero
It uses high current
The internal resistance of the cell is negligible
Which of the following factors affects resistivity of a material?
Length
Cross-sectional area
Material and temperature
Voltage applied
A 24 V battery supplies a current of 3 A to a circuit. How much charge flows in 2 minutes?
24C
120C
360C
720C
