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Electric Current Questions

Electric current is defined as the time-dependent flow of charges through a conducting material. Electric current is described as the flow of charged particles, such as electrons, across an electrical conductor.

  • The greater the voltage or potential difference, the more current flows.
  • The SI unit of electric current is ampere (A).
  • 1 Ampere = 1 Coulomb/1Second

There are two types of electric current

  • Alternating current (AC): It is the type of electric current in which the magnitude as well as the polarity of the current reverse periodically.
  • Direct Current (DC): It is the type of electric current in which the magnitude and the polarity remain constant.

Electric current questions with answers are given below.

Important Questions on Electric Current with Answers

Ques. Which among the following materials allows larger currents to flow through them?

  1. Insulators
  2. Alloys
  3. Conductors
  4. Semiconductors

Correct option: c. Conductor

Explanation: Since the number of free electrons in a conductor is larger, therefore it allows a larger current to flow through it.

Ques. The quantity of work done in joules, in moving the one-unit electric charge from one point to another point in an electric circuit is termed as:

  1. Electric Resistance
  2. Potential Difference
  3. Electric Current
  4. Electric Conductance

Correct option: b. Potential Difference

Explanation: Potential difference is defined as the amount of work done in moving a unit charge from one position to another.

Ques. The commercial unit of electrical energy is

  1. Kilojoules
  2. Watt-hour
  3. Joules
  4. Kilowatt-hour

Correct option: d. Kilowatt-hour

Explanation: The amount of energy used by a machine operating at a rate of 1KW per hour is known as the KW-hour, which is a commercial unit of electrical energy.

Ques. For confirmation of Ohm’s Law, which among the following points should be kept in mind?

  1. The ammeter should be connected in parallel and the voltmeter in series
  2. The ammeter and voltmeter should be linked in a series
  3. The Voltmeter should be connected in parallel and the ammeter in series
  4. The ammeter and voltmeter should be linked in parallel

Correct option: c. The Voltmeter should be connected in parallel and the ammeter in series.

Explanation: An ammeter is a low-resistance device, thus instead of connecting it in parallel, it is linked in series to draw zero current from the circuit. A voltmeter, on the other hand, is a higher resistance device, thus it is connected in parallel with the circuit to prevent resistance in the current flow.

Ques. What is the purpose of rheostat?

  1. Increases or decreases the magnitude of the current
  2. Increases the magnitude of current only
  3. Decreases the magnitude of current only
  4. None of the above

Correct option: a. Increases or decreases the magnitude of the current

Explanation: A rheostat is a variable resistor that allows you to modify the amount of current without interrupting its flow in a circuit.

Ques. Which among the following factors does the electrical resistivity of a metallic wire depend on?

  1. Thickness
  2. Length
  3. Its shape
  4. Nature of the material

Correct option: d. Nature of the material

Explanation: Resistivity is an intrinsic property, which means that it is determined by the material’s nature rather than its geometry.

Ques. The hindrance offered by the material of the conductor to the smooth flow of electric current is known as:

  1. Inductance
  2. Resistance
  3. Conductance
  4. None of the above

Correct option: b. Resistance

Explanation: Resistance is the property of a conductor that restricts the flow of electric current through it.

Ques. When an electric current is passed, the movement of electrons takes place from

  1. Lower potential to higher potential
  2. Out of the conductor
  3. Higher potential to lower potential
  4. Do not move

Correct option: a. Lower potential to higher potential

Explanation: The higher terminal has more positive charges, whereas the lower potential terminal has more negative charges. Because electrons are mobile, electrons from low-potential terminals move to higher-potential terminals.

Ques. Electric power is inversely proportional to

  1. Temperature
  2. Voltage
  3. Current
  4. Resistance

Correct option: d. Resistance

Explanation: The formula of electric power is given as P = V2/R, therefore it is inversely proportional to resistance.

Ques. Which of the following instruments is used to measure electric potential?

  1. Galvanometer
  2. Voltmeter
  3. Ammeter
  4. Potentiometer

Correct option: b. Voltmeter

Explanation: A voltmeter is a device that determines the potential difference between two points in an electrical circuit.

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