Ohm’s Law to Resistive Circuits with AC Sources Quizizz

In an AC circuit with only series resistances, which of the following statements is true?

• V1 and I are in phase.

• RT = R1 + R2 + R3 + ...

• Each voltage drop is in phase with the series current.

• All of the above.

An AC source is connected to a resistive circuit. Which of the following statements is true?

• Current leads the voltage, and both are in the same phase.

• Current lags behind the voltage, and both are in the same phase.

• Current and voltage are in the same phase.

• Any of the above may be true depending upon the value of resistance.

In an AC circuit, power is dissipated in:

• Resistance only.

• Inductance only.

• Capacitance only.

• None of the above.

The point to be kept in mind for the verification of Ohm's law is:

• Ammeter and voltmeter should be connected in series.

• Ammeter should be connected in series, and voltmeter in parallel.

• Ammeter should be connected in parallel, and voltmeter in series.

• None of the above.

According to Ohm's law:

• V is proportional to R.

• V is proportional to 1/R.

• V is proportional to I.

• None of the above.

Find the potential difference (in volts, V) across a resistance of 2.5 KΩ through which a 2mA current flows.

• 5

• 0.2

• 1.25

• 0.8

The potential difference at the terminals of an electrical heater is 60V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is changed to 127.5 V?

• 8.5 A

• 24 A

• 10 A

• 12 A

What is the correct expression for the instantaneous current in a resistive circuit?

• i = Vm(sint) / R

• i = Vm(cost) / R

• i = V(sint) / R

• i = V(cost) / R

Can Ohm's law be applied in an AC circuit?

• Yes

• No

• Depends on the RMS current

• Depends on the RMS voltage

Find the value of the instantaneous voltage if the resistance is 2 ohms, and the instantaneous current in the circuit is 5 amperes.

• 5 V

• 2 V

• 10 V

• 2.5 V