Which of the following is a function of a resistor?

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RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
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  1. It both allows and opposes the flow of current.
  2. It opposes the flow of current.
  3. It allows the flow of current.
  4. It neither allows nor opposes the flow of current.

Answer (Detailed Solution Below)

Option 2 : It opposes the flow of current.
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Detailed Solution

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Types of the electrical element

1.) Resistor

  • The resistor is an electrical element that opposes the flow of electric current through it.
  • This property is known as resistance.
  • The resistor does not store energy rather it dissipates energy.
  • The SI of resistance is ohm and is denoted as Ω.

2.) Inductor

  • The inductor is an electrical element that opposes the sudden change in current.
  • The inductor stores energy in form of a magnetic field.
  • This property is known as inductance.
  • The SI of inductance is Henry and is denoted as H.

3.) Capacitor

  • The capacitor is an electrical element that opposes the sudden change in voltage.
  • The capacitor stores energy in form of an electric field.
  • This property is known as capacitance.
  • The SI of capacitance is Farad and is denoted as F.

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