Chapter 20 – Heating Effects of Current and Instruments
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 20 - Heating Effects of Current and Instruments
Resistors P, Q, and R in the circuit have equal resistances. If the battery is supplying a total power of 12 W, what is the power dissipated as heat in resistor R?
06
Dec
Resistors P, Q, and R in the circuit have equal resistances. If the battery is supplying a total power of 12 W, what is the power dissipated as heat in resistor R? -q and R in the circuit have equal resistances. If the battery is supplying a total power of 12 W Resistors P what [...]
The main supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60W bulb is already giving light. What is the decrease of voltage across the bulb, when a 240W heater is switched on ?
06
Dec
The main supply voltage to room is 120V. The resistance of the lead wires is 6Ω. A 60W bulb is already giving light. What is the decrease of voltage across the bulb, when a 240W heater is switched on ? The main supply voltage to room is 120V. The resistance of the lead wires is [...]
A heater is designed to operate with a power of 1000W in a 100V line. It is connected in combination with a resistance of 10Ω and a resistance R, to a 100V mains as shown in figure. What will be the value of R so that the heater operates with a power of 62.5W?
06
Dec
A heater is designed to operate with a power of 1000W in a 100V line. It is connected in combination with a resistance of 10Ω and a resistance R, to a 100V mains as shown in figure. What will be the value of R so that the heater operates with a power of 62.5W? A [...]
A torch bulb rated 4.5 W, 1.5 V is connected as in figure. The emf of the cell needed to make the bulb glow at full intensity is
06
Dec
A torch bulb rated 4.5 W, 1.5 V is connected as in figure. The emf of the cell needed to make the bulb glow at full intensity is 1.5 V is connected as in figure. The emf of the cell needed to make the bulb glow at full intensity is A torch bulb rated 4.5 [...]
Three 10Ω,2W resistors are as in figure. The maximum possible voltage between points A and B without exceeding the power dissipation limits of any of the resistors is
06
Dec
Three 10Ω,2W resistors are as in figure. The maximum possible voltage between points A and B without exceeding the power dissipation limits of any of the resistors is 2W resistors are as in figure. The maximum possible voltage between points A and B without exceeding the power dissipation limits of any of the resistors is [...]
An electric bulb rated for 500W at 100V is used in circuit having 200V supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W is
06
Dec
An electric bulb rated for 500W at 100V is used in circuit having 200V supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W is An electric bulb rated for 500W at 100V is used in circuit having 200V supply. The resistance R that must [...]
If the current in an electric bulb decreases by 0.5%, the power in the bulb decreases by approximately
06
Dec
If the current in an electric bulb decreases by 0.5%, the power in the bulb decreases by approximately If the current in an electric bulb decreases by 0.5% the power in the bulb decreases by approximately December 6, 2020 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 20 - Heating Effects of Current [...]
Two electric bulbs , rated for the same voltage , have powers of 200W and 100W, respectively. If their resistances are r1 and r2 , respectively , then
06
Dec
Two electric bulbs , rated for the same voltage , have powers of 200W and 100W, respectively. If their resistances are r1 and r2 , respectively , then have powers of 200W and 100W rated for the same voltage respectively respectively. If their resistances are r1 and r2 then Two electric bulbs December 6, 2020 [...]
Two similar headlight lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament?
06
Dec
Two similar headlight lamps are connected in parallel to each other. Together, they consume 48 W from a 6 V battery. What is the resistance of each filament? they consume 48 W from a 6 V battery. What is the resistance of each filament? Two similar headlight lamps are connected in parallel to each other. [...]
A cell of internal resistances 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 load )/( Energy dissipated in the complete circuit) Which of the following gives the efficiency in this case?
06
Dec
A cell of internal resistances 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 load )/( Energy dissipated in the complete circuit) [...]