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A potentiometer wire has length of 2m and resistance 10Ω. It is connected in series with resistance 990Ω and a cell of e.m.f. 2V. Calculate the potential gradient along the wire.
Concept: Meter Bridge
Explain the principle of potentiometer.
Concept: Meter Bridge
In an AC circuit, e and i are given by e = 150 sin(150t)V and i = 150 sin `(150t + π/3)` A. The power dissipated in the circuit is ______.
Concept: AC Circuits
When an AC source is connected to an ideal inductor show that the average power supplied by the source over a complete cycle is zero.
Concept: Power in AC Circuit
Derive an expression for the impedance of an LCR circuit connected to an AC power supply. Draw phasor diagram.
Concept: LC Oscillations
A 15.0 μF capacitor is connected to a 220 V, 50 Hz source. Find the capacitive reactance and the current (rms and peak) in the circuit. If the frequency is doubled, what will happen to the capacitive reactance and the current?
Concept: Average and RMS Values
A 25 μF capacitor, a 0.10 H inductor, and a 25Ω resistor are connected in series with an AC source whose emf is given by e = 310 sin 314 t (volt). What is the frequency, reactance, impedance, current, and phase angle of the circuit?
Concept: Power in AC Circuit
If the effective current in a 50 cycle AC circuit is 5 A, what is the peak value of current? What is the current 1/600 after if was zero?
Concept: Average and RMS Values
An electric bulb operates 10 V d.c. If this bulb is connected to an a.c. source and gives normal brightness, then the peak value of the source is ______
Concept: AC Circuits
A coil of resistance 300Ω and inductance 1.0 H is connected across an alternating voltage of frequency `300/(2pi)` Hz, therefore phase difference between the voltage and current in the circuit is ______
Concept: AC Circuits
State the equation for impedance Z in an A.C. circuit.
Concept: AC Circuits
If the peak value of an alternating emf is 15V, what is its mean value over half cycle?
Concept: AC Circuits
State the average or mean value of an alternating emf? Obtain the expression for it.
Concept: Average and RMS Values
What is the capacitive reactance of a capacitor of 5µF at a frequency of (1) 50 Hz and (2) 20KHZ?
Concept: AC Circuits
Explain the term inductive reactance. State its unit and dimensions.
Concept: AC Circuits
Explain the term capacitive reactance. State its unit and dimensions.
Concept: Phasors
An alternating emf of 230V, 50Hz is connected across a pure ohmic resistance of 50Ω. Find (1) the current (2) equations for instantaneous values of current and voltage.
Concept: Phasors
Obtain the expression for the applied emf and the effective resistance of the circuit when alternating emf is applied to an LR circuit.
Concept: AC Circuits
Obtain the expression for the applied emf and the effective resistance of the circuit when alternating emf is applied to a CR circuit.
Concept: AC Circuits
A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.
- What is the rms value of current in the circuit?
- What is the net power consumed over a full cycle?
Concept: Different Types of AC Circuits: AC Voltage Applied to a Resistor
