Wheatstone bridge is an arrangement of _____ resistors used for accurate measurement of resistance.

The correct answer is four.

Key Points

• Wheatstone bridge, also known as the resistance bridge, calculates the unknown resistance by balancing two legs of the ground circuit.
• One leg includes the element of unknown resistance.
• The Wheatstone Bridge Circuit comprises two known resistors, one unknown resistor, and one variable resistor connected in the form of ground.
• This ground is veritably dependable as it gives accurate measures.

Important Points

• Wheatstone Bridge Principal:
  • The Wheatstone bridge works on the principle of null deflection, i.e. the rate of their resistances is equal, and no current flows through the circuit.
  • Under normal conditions, the ground is in an unstable condition where current overflows through the galvanometer.
  • The bridge is said to be balanced when no current flows through the galvanometer.
  • This condition can be achieved by conforming the known resistance and variable resistance.
• Wheatstone Bridge Formula:
  • Following is the formula used for the Wheatstone bridge:
  • \(R = PS/Q\)
  • Where, R is the unknown resistance
  • S is the standard arm of the bridge
  • P and Q is the ratio of the arm of the bridge