The circuit in the drawing is known as a Wheatstone bridgecircuit.Find the voltage between points B and D,andstate which point is at the higher potential.
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Figure P 18.19 shows a Wheatstone bridge, a circuit used to precisely measure an unknown resistance R by varying until the ammeter reads zero current and the bridge is said to be "balanced." If the bridge is balanced with
(a) find the value of unknown resistance R.
(b) the current in the resistance.
An ac source with a maximum voltage of 150V and f= 50Hz is connected between points 'a' and 'd' as shown in the figure.
Figure P18.19 shows a Wheatstone bridge, a circuit used to precisely measure an unknown resistance R by varying Rvar until the ammeter reads zero current and the bridge is said to be "balanced." If the bridge is balanced with , find (a) the value of the unknown resistance R and (b) the current in the resistor. (Hint: With the bridge balanced, the wire through the ammeter can effectively be removed from the circuit, leaving two pairs of resistors in parallel.
