What is the current through a short circuit?
A short circuit implies that the two terminals are externally connected with resistance R=0 , the same as an ideal wire. This means there is zero voltage difference for any current value. This means that zero current can flow between the two terminals, regardless of any voltage difference.
Why is AC current used in Wheatstone bridge?
Applying ac to the bridge gives us some additional flexibility: we are no longer limited to resistors and resistive devices as components in the bridge. We can now include capacitors and inductors. This allows us to make the balance of the bridge depend on frequency and/or phase angle as well as impedance.
What are the AC source of EMF?
Alternating current (ac) is the flow of electric charge that periodically reverses direction. An ac is produced by an alternating emf, which is generated in a power plant, as described in Induced Electric Fields. If the ac source varies periodically, particularly sinusoidally, the circuit is known as an ac circuit.
How are the resistors on a Wheatstone bridge connected?
A Wheatstone bridge consists of four resistors (R 1, R 2, R 3 and R 4) that are connected in the shape of a diamond with the DC supply source connected across the top and bottom points (C and D in the circuit) of the diamond and the output is taken across the other two ends (A and B in the circuit).
When is the current through the Wheatstone bridge zero?
Wheatstone Bridge Derivation The current enters the galvanometer and divides into two equal magnitude currents as I 1 and I 2. The following condition exists when the current through a galvanometer is zero, (1)
Is the Wheatstone bridge circuit the same as teilam?
Two different presentations are given in fig. 1: a) is based on the original notation of Wheatstone, and b) is another notation that is usually easier to understand by a person without a background in electrical or electronic engineering. Both versions are, in fact, identical in their electrical function. Fig. 1: The Wheatstone bridge circuit
Which is the correct formula for Wheatstone bridge?
Equation (2) shows the balanced condition of the bridge while (3) determines the value of the unknown resistance. In the figure, R is the unknown resistance, and S is the standard arm of the bridge and P and Q are the ratio arm of the bridge. Following is the formula used for Wheatstone bridge: