Advanced Circuit Components & Connections Assessment

In a rheostat, what physical action causes the resistance to change?

• Moving a sliding contact along the wire
• Changing the temperature of the wire
• Adding more wire to the circuit
• Increasing the voltage

If a rheostat has maximum resistance of 100Ω and the sliding contact is moved to the midpoint, what would be the approximate resistance?

• 50Ω
• 100Ω
• 200Ω
• 25Ω

In a series circuit with three resistors (2Ω, 4Ω, and 6Ω), what is the total resistance?

• 12Ω
• 4Ω
• 6Ω
• 2Ω

What happens to the current in a series circuit if one resistor's value is doubled?

• The current decreases
• The current increases
• The current stays the same
• The current becomes zero

In a parallel circuit with two 6Ω resistors, what is the equivalent resistance?

• 3Ω
• 12Ω
• 6Ω
• 9Ω

If a 9V battery powers three resistors in series, and the voltage drop across the first two resistors is 3V and 4V respectively, what is the voltage drop across the third resistor?

• 2V
• 7V
• 9V
• 1V

Which statement about current in a parallel circuit is correct?

• The total current equals the sum of individual currents
• The current is the same through each branch
• The current decreases with each branch
• The current doubles with each branch

Three 1.5V cells are connected in series. What is the total EMF?

• 4.5V
• 1.5V
• 3.0V
• 0.5V

What happens to the equivalent resistance when resistors are added in parallel?

• It decreases
• It increases
• It stays the same
• It multiplies

Why might you use a rheostat in a circuit?

• To control current flow
• To increase voltage
• To store energy
• To measure current