Which of the following is required to convert a milliammeter to an ammeter?
A high resistance in parallel
A high resistance in series
A low resistance in parallel
A low resistance in series
Correct answer is C
No explanation has been provided for this answer.
If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
5.00W
4.00W
2.00W
25W
Correct answer is B
P = \(\frac{V^2}{R}\)
= \(\frac{20 \times 20}{100}\)
= 4W
0.5kJ
8.0kJ
20.0kJ
40.0kJ
Correct answer is D
Heat energy = Elect. energy
heat energy= I2RT
= 2 X 2 X 50 X 200
= 40000J
to convert to kJ, divide J by 1000
hence, \(\frac{40000}{1000}\) = 40kJ
The purpose of a dielectric material in a parallel plate capacitor is to
increase its capacitance
decrease its capacitance
insulate the plate from each other
increase the magnetic field between the plates
Correct answer is C
No explanation has been provided for this answer.
16.0A
8.0A
0.8A
0.4A
Correct answer is B
I = \(\frac{E.m.f}{R + r}\)
= \(\frac{12}{1 + 0.5}\)
I = 8A