04. Cells, Internal Resistance and Cell Combination, Thermocouple
Current Electricity

152531 A battery is charged at a potential of $15 \mathrm{~V}$ in $8 \mathrm{~h}$ when the current flowing is $10 \mathrm{~A}$. The battery on discharge supplies a current of $5 \mathrm{~A}$ for $15 \mathrm{~h}$. The mean terminal voltage during discharge is $14 \mathrm{~V}$. The watt- hour efficiency of battery is

1 $80 \%$
2 $90 \%$
3 $87.5 \%$
4 $82.5 \%$
Current Electricity

152554 A battery of emf $10 \mathrm{~V}$ and internal resistance $0.5 \Omega$ is connected across a variable resistance $R$. The value of $R$ for which the power delivered in it is maximum, is given by

1 $0.5 \Omega$
2 $1.0 \Omega$
3 $2.0 \Omega$
4 $0.25 \Omega$
Current Electricity

152564 A lead-acid battery of a car has an e.m.f. of 12 $\mathrm{V}$. If the internal resistance of the battery is 0.5 ohm, the maximum current that can be drawn from the battery will be

1 $30 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $24 \mathrm{~A}$
Current Electricity

152588 Which of the following are true when the cells are connected in series?

1 Current capacity decreases
2 Current capacity increases
3 The emf decrease
4 The emf increases
Current Electricity

152531 A battery is charged at a potential of $15 \mathrm{~V}$ in $8 \mathrm{~h}$ when the current flowing is $10 \mathrm{~A}$. The battery on discharge supplies a current of $5 \mathrm{~A}$ for $15 \mathrm{~h}$. The mean terminal voltage during discharge is $14 \mathrm{~V}$. The watt- hour efficiency of battery is

1 $80 \%$
2 $90 \%$
3 $87.5 \%$
4 $82.5 \%$
Current Electricity

152554 A battery of emf $10 \mathrm{~V}$ and internal resistance $0.5 \Omega$ is connected across a variable resistance $R$. The value of $R$ for which the power delivered in it is maximum, is given by

1 $0.5 \Omega$
2 $1.0 \Omega$
3 $2.0 \Omega$
4 $0.25 \Omega$
Current Electricity

152564 A lead-acid battery of a car has an e.m.f. of 12 $\mathrm{V}$. If the internal resistance of the battery is 0.5 ohm, the maximum current that can be drawn from the battery will be

1 $30 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $24 \mathrm{~A}$
Current Electricity

152588 Which of the following are true when the cells are connected in series?

1 Current capacity decreases
2 Current capacity increases
3 The emf decrease
4 The emf increases
Current Electricity

152531 A battery is charged at a potential of $15 \mathrm{~V}$ in $8 \mathrm{~h}$ when the current flowing is $10 \mathrm{~A}$. The battery on discharge supplies a current of $5 \mathrm{~A}$ for $15 \mathrm{~h}$. The mean terminal voltage during discharge is $14 \mathrm{~V}$. The watt- hour efficiency of battery is

1 $80 \%$
2 $90 \%$
3 $87.5 \%$
4 $82.5 \%$
Current Electricity

152554 A battery of emf $10 \mathrm{~V}$ and internal resistance $0.5 \Omega$ is connected across a variable resistance $R$. The value of $R$ for which the power delivered in it is maximum, is given by

1 $0.5 \Omega$
2 $1.0 \Omega$
3 $2.0 \Omega$
4 $0.25 \Omega$
Current Electricity

152564 A lead-acid battery of a car has an e.m.f. of 12 $\mathrm{V}$. If the internal resistance of the battery is 0.5 ohm, the maximum current that can be drawn from the battery will be

1 $30 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $24 \mathrm{~A}$
Current Electricity

152588 Which of the following are true when the cells are connected in series?

1 Current capacity decreases
2 Current capacity increases
3 The emf decrease
4 The emf increases
Current Electricity

152531 A battery is charged at a potential of $15 \mathrm{~V}$ in $8 \mathrm{~h}$ when the current flowing is $10 \mathrm{~A}$. The battery on discharge supplies a current of $5 \mathrm{~A}$ for $15 \mathrm{~h}$. The mean terminal voltage during discharge is $14 \mathrm{~V}$. The watt- hour efficiency of battery is

1 $80 \%$
2 $90 \%$
3 $87.5 \%$
4 $82.5 \%$
Current Electricity

152554 A battery of emf $10 \mathrm{~V}$ and internal resistance $0.5 \Omega$ is connected across a variable resistance $R$. The value of $R$ for which the power delivered in it is maximum, is given by

1 $0.5 \Omega$
2 $1.0 \Omega$
3 $2.0 \Omega$
4 $0.25 \Omega$
Current Electricity

152564 A lead-acid battery of a car has an e.m.f. of 12 $\mathrm{V}$. If the internal resistance of the battery is 0.5 ohm, the maximum current that can be drawn from the battery will be

1 $30 \mathrm{~A}$
2 $20 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $24 \mathrm{~A}$
Current Electricity

152588 Which of the following are true when the cells are connected in series?

1 Current capacity decreases
2 Current capacity increases
3 The emf decrease
4 The emf increases