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Current electricity questions

Current electricity questions | form six Physics

Find Current electricity examination questions, form six Physics in acaproso.com

# Question
1

A 25μF capacitor, a 0.10H inductor and a 25Ω resistor are connected in series with an a.c.
source whose e.m.f. Is given by ​ E=310sin314​t ​ volt. Determine the;
(i) Frequency of the e.m.f.
(ii) Net reactance of the circuit.


Mathematical Calculation
2

What is meant by the following terms:
(i) Internal resistance of a cell.
(ii) Drift velocity.


Short answers
3

What is a potentiometer.


Short answers
4

Mention two advantages and two disadvantages of potentiometer.


Short answers
5

State Kirchhoff’s laws of electric network.


Short answers
6

Find the value of the current ​ I ​ in the circuit shown in Figure1.

Find the value of the current ​ I ​ in the circuit shown in Figure 1.


Mathematical Calculation
7

Sketch the diagram showing the variation of current with potential difference across the
following:
(i) Filament electric bulb.
(ii) Gas-filled diode.


Short answers
8

A wire of diameter 0.1​mm and resistivity 1.69×10​-8​Ω​m with temperature coefficient of
resistance of 4.3×10-3​K-1​ ​ was required to make a resistance.
(i) What length of the wire is required to make a coil with a resistance of 0.5Ω?
(ii) If on passing a current of 2​A the temperature of the coil in (i) above rises by 10°​C, ​
what error would arise in taking the potential drop as 1.0V? ​


Mathematical Calculation
9

What is meant by the following terms:
(i) Alternating current (a.c.).
(ii) Effective value of A.C.


Short answers
10

A 60​volt , ​ 10​watt ​ lamp is to be run on 100​volt , ​ 60​Hz ​A.C. mains.
(i) Calculate the inductance of a choke coil required.
(ii) If a resistor is used in (i) above instead of choke, what will be the value of its
resistance?


Mathematical Calculation