Q. 4 A4.0( 29 Votes )

# Three resistors 2 W, 4 W and 5 W are combined in parallel. What is the total resistance of the combination?

Answer :

Since three resistors are connected in parallel, hence total resistance(R) of the combination is given by

Hence, Total Resistance is 1.05 Ω

Rate this question :

An inductor-coil, a capacitor and an AC source of rms voltage 24 V are connected in series. When the frequency of the source is varied, a maximum rms current of 6.0 A is observed. If this inductor coil is connected to a battery of emf 12 V and internal resistance 4.0Ω, what will be the current?

HC Verma - Concepts of Physics Part 2An inductance of 2.0 H, a capacitance of 18 μF and a resistance of 10 kΩ are connected to an AC source of 20 V with adjustable frequency.

(a) What frequency should be chosen to maximize the current in the circuit?

(b) What is the value of this maximum current?

HC Verma - Concepts of Physics Part 2

The current in a discharging LR circuit is given by i = i_{0}e^{–t/τ} where τ is the time constant of the circuit. Calculate the rms current for the period t = 0 to t = τ.

The household supply of electricity is at 220 V (rms value) and 50 Hz. Find the peak voltage and the least possible time in which the voltage can change from the rms value to zero.

HC Verma - Concepts of Physics Part 2Find the time required for a 50 Hz alternating current to change its value from zero to the rms value.

HC Verma - Concepts of Physics Part 2