Unit-9 Electricity

Fill in the blank: In a parallel circuit, current divides such that the branch with lower resistance has a ________ current, and the branch with higher resistance has a ________ current.

• lower, higher

• warmer, higher

• higher, lower

• lower, slower

Problem-solving: A parallel circuit has two branches. The resistance in branch A is 2 Ω, and in branch B is 4 Ω. If the total current entering the circuit is 6 A, calculate the current through each branch.

• A = 5A, B = 3A

• A = 6A, B = 1A

• A = 4A, B = 2A

MCQ: In a parallel circuit, if the resistance in one branch is halved, what happens to the current through that branch?

• It doubles

• It halves

• It remains the same

Fill in the blank: A parallel circuit with a voltage of 12 V and two branches with resistances labelled as 2 Ω and 4 Ω. The voltage in each branch is (a)   .

Fill in the blank: To measure the current in a circuit, an ________ is connected in ________, and to measure voltage, a ________ is connected in ________.

• Ammeter, parallel, voltmeter, series

• Voltmeter, series, Ammeter parallel

• Ammeter, series, Voltmeter, parallel

• Voltmeter, combined, Ammeter, combined.

In a series circuit with three identical lamps and one 6 V cell, the voltage across each lamp is measured as 2 V. If another identical cell is added, what will be the voltage across each lamp?

• Voltage across each lamp = 6 V

• Voltage across each lamp = 4 V

• Voltage across each lamp = 2 V

• Voltage across each lamp = 12V

A simple circuit with an ammeter connected in series and a voltmeter connected across a resistance. Identify if the instruments are connected correctly.

• Yes

• No.

Fill in the blank: Resistance is measured in ________, voltage in ________, and current in ________.

• Volts (V), Amperes (A), Ohms (Ω)

• Amperes (A), Volts (V), Ohms (Ω)

• Ohms (Ω), Volts (V), Amperes (A)

• None of the above

Problem-solving: A circuit has a voltage of 12 V and a current of 3 A. Calculate the resistance in the circuit.

• R = 3Ω

• R = 2Ω

• R = 5Ω

• R = 4Ω

MCQ: If the resistance of a wire is doubled, the current through the wire will:

• Double

• Halve

• Remain the same