Understanding Electric Potential
Trending Questions
Q. The e.m.f. of a cell is ε and its internal resistance is r. Its terminals are connected to a resistance R. The potential difference between the terminals is 1.6 V for R=4Ω and 1.8 V for R=9Ω. Then,
- ε=1V, r=1Ω
- ε=2V, r=1Ω
- ε=2V, r=2Ω
- ε=2.5V, r=0.5Ω
Q. The e.m.f. of a cell is ε and its internal resistance is r. Its terminals are connected to a resistance R. The potential difference between the terminals is 1.6 V for R=4Ω and 1.8 V for R=9Ω. Then,
- ε=1V, r=1Ω
- ε=2V, r=1Ω
- ε=2V, r=2Ω
- ε=2.5V, r=0.5Ω
Q.
For setup shown in diagram, find VA−VB
For setup shown in diagram, find VA−VB
- 13 V
- 16 V
- 8 V
- 12 V
Q. The e.m.f. of a cell is ε and its internal resistance is r. Its terminals are connected to a resistance R. The potential difference between the terminals is 1.6 V for R=4Ω and 1.8 V for R=9Ω. Then,
- ε=1V, r=1Ω
- ε=2V, r=1Ω
- ε=2V, r=2Ω
- ε=2.5V, r=0.5Ω
Q. A cell of internal resistance r is connected to a load of resistance R. 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
Energy dissipated in the loadEnergy dissipated in the complete circuit
Which of the following gives the efficiency in this case?
Energy dissipated in the loadEnergy dissipated in the complete circuit
Which of the following gives the efficiency in this case?
- rR
- Rr
- rR+r
- RR+r