Part – A

 Define electric potential difference.
 Explain the function of conductor. In what forms is it used and where.
 Calculate the resistance of a 400 W bulb connected across 230 volts power line.
 What is the shunt resistance R_{s} needed to extend the range of 50Ω, 1mA movement to 100 mA.
 If a rms voltage of 120 V is applied across a 100 ohms resistor. What would be its rms current?
 Show how two resistance A and B are connected in parallel across a battery
 What is magnetic saturation
 Calculate the capacitance of a capacitor with plate area of 50 cm^{2} and dielectric thickness of 0.5mm with air as dielectric
 What is the peak to peak value of a sine wave whose rms value is 10 volts
Part – B
Unit I

 Describe frequency of an alternating voltage.
 The conductance of a wire at 100°C is one tenth its value at 25°C. If the wire resistance equals 10 ohms at 25°C. Calculate the resistance of the wire at 100°C.

 Explain the color coding for resistors. Also how the color coding determines the tolerance of resistor.
 A 60 volts source is connected across a 30 kiloohm resistance:
 Draw the schematic diagram
 How much current flows through the resistance?
 Give the color code of the resistance
Unit II

 Define voltmeter.
 Explain the loading effect of the voltmeter.
 Use the method of mesh currents to solve for IR_{1} , IR_{2} , IR_{3} , VR_{1} , VR_{2} and VR_{3} in the circuit given below:
Unit III

 Explain why the terminal voltage of a battery drops with more load current.
 Explain the main parts of the electric motors.

 Explain in brief leadacid wet cell.
 A6 volt leadacid battery has an internal resistance of 0.01 Ohm. How much current will flow if the battery has a short circuit?
Unit IV

 Explainable magnetic field.
 The flux density in an iron core is 0.5^{T} if the area of the core is 10 cm^{2}. Calculate the total number of flux lines in the core.

 What is meant by a dielectric material? Name four common dielectric materials where it is used.
 A microfarad capacitor C_{1} and a 10 microfarad capacitor C_{2} are in series with a constant 2 milli ampere charging current:
 After 4 seconds, how much charge is in C_{1} and in C_{2}.
 How much is the voltage across C_{1} and across C_{2}.
Unit V

 Explain in brief about semiconductors,
 Define hole charge and hole current.
 Explain the concept of PN junction.
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