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A line having a total resistance of 0.2 ohm delivers 10 K W at 220 V to a small factory. calculate the efficiency of transmission.
04
Sep
A line having a total resistance of 0.2 ohm delivers 10 K W at 220 V to a small factory. calculate the efficiency of transmission. A line having a total resistance of 0.2 ohm delivers 10 K W at 220 V to a small factory. calculate the efficiency of transmission. September 4, 2020 Category: Uncategorised [...]
Two wires made of tinned copper having identical cross-section (=10^−6 m^2) and lengths 10cm and 15cm are to be used as fuses. Sow that the fuses will melt at the same value of current in each case.
04
Sep
Two wires made of tinned copper having identical cross-section (=10^−6 m^2) and lengths 10cm and 15cm are to be used as fuses. Sow that the fuses will melt at the same value of current in each case. Two wires made of tinned copper having identical cross-section (=10^−6 m^2) and lengths 10cm and 15cm are to [...]
How will you connect (series and parallel ) 24 cell each of internal resistance 1 ohm to get maximum power output across a load of 10 ohm?
04
Sep
How will you connect (series and parallel ) 24 cell each of internal resistance 1 ohm to get maximum power output across a load of 10 ohm? How will you connect (series and parallel ) 24 cell each of internal resistance 1 ohm to get maximum power output across a load of 10 ohm? September [...]
A and B are two identical bulbs of 40W connected to a V=12 volt cell. Switch S is closed to connect a third bulb C in the circuit. What happens to brightness of bulb A? Answer for two cases: (i) Bulb C is a very high wattage bulb. (ii) Bulb C is a very low wattage bulb. All the three bulbs have rated voltage of 12 volt.
04
Sep
A and B are two identical bulbs of 40W connected to a V=12 volt cell. Switch S is closed to connect a third bulb C in the circuit. What happens to brightness of bulb A? Answer for two cases: (i) Bulb C is a very high wattage bulb. (ii) Bulb C is a very low [...]
A bulb B is connected to a source having constant emf and some internal resistance. A variable resistance R is connected in parallel to the bulb. If the resistance R is increased, how will it affect the- (a) Brightness of the bulb? (b) Power spent by the source ?
04
Sep
A bulb B is connected to a source having constant emf and some internal resistance. A variable resistance R is connected in parallel to the bulb. If the resistance R is increased, how will it affect the- (a) Brightness of the bulb? (b) Power spent by the source ? A bulb B is connected to [...]
An electric tea kettle has two heating coils. When one of the coils is switched on , boiling begins in 6min. When the other coil is switched on , boiling begins in 8min. In what time will the boiling begin if both coils are switched on simultaneously (i) in series and (ii) in parallel.
04
Sep
An electric tea kettle has two heating coils. When one of the coils is switched on , boiling begins in 6min. When the other coil is switched on , boiling begins in 8min. In what time will the boiling begin if both coils are switched on simultaneously (i) in series and (ii) in parallel. An [...]
Two bulbs are rated 30 W -200 W and 60 W -200 V. they are connected with a 400 V power supply. find which bulb wii get fused if they are connected in (a) series and (b) parallel.
04
Sep
Two bulbs are rated 30 W -200 W and 60 W -200 V. they are connected with a 400 V power supply. find which bulb wii get fused if they are connected in (a) series and (b) parallel. Two bulbs are rated 30 W -200 W and 60 W -200 V. they are connected with [...]
Two bulbs are marked 220 V – 100 W and 220 V – 50 W . a) which bulb will produce more illumination if they are connected in parallel to a 220 V supply? b) which bulb will produce more illumination if they are connected in series to a 220 V supply? c) Also find the total power consumed by both the bulb in each of the two parts above.
04
Sep
Two bulbs are marked 220 V – 100 W and 220 V – 50 W . a) which bulb will produce more illumination if they are connected in parallel to a 220 V supply? b) which bulb will produce more illumination if they are connected in series to a 220 V supply? c) Also find [...]
A 500W heating unit is designed to operate from a 200V line . By what percentage will its heat output drop if the line voltage drops to 160V? Find the heat produced by it in 10 min.
03
Sep
A 500W heating unit is designed to operate from a 200V line . By what percentage will its heat output drop if the line voltage drops to 160V? Find the heat produced by it in 10 min. A 500W heating unit is designed to operate from a 200V line . By what percentage will its [...]
A 100W bulb is designed to operate on a potential difference of 230V. (i) Find the resistance of the bulb. (ii) Find the current drawn by the bulb if it is operated at a potential difference for which it is designed. (iii) Find the current drawn and power consumed by the bulb if it is connected to a 200V supply.
03
Sep
A 100W bulb is designed to operate on a potential difference of 230V. (i) Find the resistance of the bulb. (ii) Find the current drawn by the bulb if it is operated at a potential difference for which it is designed. (iii) Find the current drawn and power consumed by the bulb if it is [...]