Wheatstone Bridge Circuit

Question 1

Wheatstone Bridge Circuit

Answer 1

A circuit where errors in calibration and with the resistance of the ammeter and voltmeters are overcame as the circuit is an example of a null deflection indicator. V=0

Question 2

Balanced bridge

Answer 2

When R1/R2 = R3/R4.

The resistors in exact equation are the ones on the same side as the other.

Question 3

Unbalanced bridge

Answer 3

If the bridge is initially balanced then one of the resistors is altered a small amount, the reading on the meter is directly proportional to that change.

Question 4

What effect will a change in potential difference have on a balanced Wheatstone bridge

Answer 4

The reading on the voltmeter will not change, it will still be 0 V.
Because the voltage across R1 and the voltage across R3 will always be equal to each other, independent of the supply voltage

Question 5

Calculating the P.D of a resistor in Wheatstone bridge

Answer 5

Use R1/R1+R2 * Vs where R1 is resistor which pd across is trying to be found and R2 is resistor across from it (not the one parallel to it that is used in balanced Wheatstone bridge equation)