A cell of internal resistance is connected to a load of resistance
. Energy is dissipated in the load, but some thermal energy is also wasted in the cell. The efficiency of such an arrangement is found from the expression
Which of the following gives the efficiency in this case?
a) |
|
b) |
|
c) |
|
d) |
|
A cell of internal resistance is connected to a load of resistance
. Energy is dissipated in the load, but some thermal energy is also wasted in the cell. The efficiency of such an arrangement is found from the expression
Which of the following gives the efficiency in this case?
a) |
|
b) |
|
c) |
|
d) |
|
(d)
Assuming current flows through the circuit
Energy dissipated in load
Energy dissipated in the compete circuit
The efficiency
Relation between resistance, mass and cross-sectional area
When the forward bias voltage of a diode is changed from 0.6 V to 0.7 V, the current changes from 5 mA to 15 mA. Then its forward bias resistance is |
|||||||
a) |
0.01 |
b) |
0.1 |
c) |
10 |
d) |
100 |
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