NEET-XII-Physics
03: Current Electricity
- #21Determine the current drawn from a 12 V supply with internal resistance 0.5 ``\Omega`` by the infinite network shown in Fig. 3.32. Each resistor has 1 ``\Omega`` resistance.
Ans : The resistance of each resistor connected in the given circuit, R = 1 ``\Omega``
Equivalent resistance of the given circuit = R’
The network is infinite. Hence, equivalent resistance is given by the relation,
Negative value of R’ cannot be accepted. Hence, equivalent resistance,
Internal resistance of the circuit, r = 0.5 ``\Omega``
Hence, total resistance of the given circuit = 2.73 + 0.5 = 3.23 ``\Omega``
Supply voltage, V = 12 V
According to Ohm’s Law, current drawn from the source is given by the ratio,
= 3.72 A