Electrical Energy, Power and Heating Effect

JEE Main Physics · Current Electricity · 19 questions, latest first

• Refer to the circuit diagram given below. The heat generated across the 6 Ω resistance in 100 second is (α)/100 J. The value of α…20266 April, Shift 1 · Q46
• An electric power line having total resistance of 2 Ω, delivers 1 kW of power at 250 V. The percentage efficiency of transmission…202622 January, Shift 2 · Q38
• A battery with EMF E and internal resistance r is connected across a resistance R. The power consumption in R will be maximum…202621 January, Shift 2 · Q41
• The heat generated in 1 minute between points A and B in the given circuit, when a battery of 9 V with internal resistance of 1 Ω…202621 January, Shift 1 · Q49
• There are 'n' number of identical electric bulbs, each is designed to draw a power p independently from the mains supply. They…20254 April, Shift 2 · Q36
• A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6 %, then the loss of power in units of…20253 April, Shift 2 · Q39
• The battery of a mobile phone is rated as 4.2 V, 5800 mAh. How much energy is stored in it when fully charged?20252 April, Shift 1 · Q35
• Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating…20248 April, Shift 2 · Q41
• A heater is designed to operate with a power of 1000 W in a 100 V line. It is connected in combination with a resistance of 10 Ω…20248 April, Shift 2 · Q56
• The ratio of heat dissipated per second through the resistance 5 Ω and 10 Ω in the circuit given below is:20245 April, Shift 2 · Q42
• An electric bulb rated 50 W-200 V is connected across a 100 V supply. The power dissipation of the bulb is:20244 April, Shift 2 · Q42
• By what percentage will the illumination of the lamp decrease if the current drops by 20\%?202431 January, Shift 2 · Q41
• In the following circuit, the battery has an emf of 2 V and an internal resistance of 2/3 Ω. The power consumption in the entire…202431 January, Shift 2 · Q56
• When a potential difference V is applied across a wire of resistance R, it dissipates energy at a rate W. If the wire is cut into…202430 January, Shift 2 · Q41
• Different combination of 3 resistors of equal resistance R are shown in the figures. The increasing order for power dissipation…202313 April, Shift 1 · Q50
• A potential V_o is applied across a uniform wire of resistance R. The power dissipation is P_1. The wire is then cut into two…202313 April, Shift 1 · Q60
• Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat…202311 April, Shift 1 · Q40
• The H amount of thermal energy is developed by a resistor in 10 s when a current of 4 A is passed through it. If the current is…202331 January, Shift 2 · Q9
• Ratio of thermal energy released in two resistors R and 3R connected in parallel in an electric circuit is:202329 January, Shift 1 · Q3