INSIGHT UPSC QUIZ

Science & Technology General Science
Q.

Consider the following statements:

1. The direction of current is taken opposite to the direction of flow of electrons.

2. Resistance is a property of a conductor that generates heat in the electrical circuit.

3. The SI unit of electric current is Amperes. 

Select the correct answer using the code given below:

Explanation:

ANSWER: (D)

  • All the statements are correct.
  • The SI unit of electric current is ampere. A stream of electrons moving through a conductor constitutes an electric current. Conventionally, the direction of current is taken opposite to the direction of flow of electrons. To set the electrons in motion in an electric circuit, we use a cell or a battery. A cell generates a potential difference across its terminals. It is measured in volts (V). 
  • Resistance is a property that resists the flow of electrons in a conductor. It controls the magnitude of the current.  It also generates heat in the electrical circuit. The SI unit of resistance is ohm (Ω). 

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