A lit of mass M=0.8 ton is raised to a height h=40m in t=0.5min. The voltage across the motar terminals is V=220V and the motar efficiency `eta=90%`. Find the power an current consumed by the motar and the price of one hoisting if B.O.T. costs 60 paise.

The voltage across a lamp is (6.0 +- 0.1) V and the current passing through it is (4.0 +- 0.2) ampare. Find the power consumed by the lamp.

The voltage across a lamp is (6.0 +- 0.1) V and the current passing through it is (4.0 +- 0.2) ampare. Find the power consumed by the lamp.

A transformer of efficiency 90% has turns ratio 1 : 10. If the voltage across the primary is 220 V and current in the primary is 0.5 A, then the current in secondary is

A transformer of efficiency 90% has turns ratio 10 : 1. If the voltage across the primary is 220 V and current in the primary is 0.5 A, then the current in secondary is

A 100 Omega resistasnce is connected in series with a 4 H inductor. The voltage across the resistor is V_R=(2.0V)sin(10^3 rad//s)t : (a) Find the expession of circuit current (b) Find the inductive reactance (c) derive an expression for the voltage across the inductor,

A 100 Omega resistasnce is connected in series with a 4 H inductor. The voltage across the resistor is V_R=(2.0V)sin(10^3 rad//s)t : (a) Find the expession of circuit current (b) Find the inductive reactance (c) derive an expression for the voltage across the inductor,

A 100 Omega resistasnce is connected in series with a 4 H inductor. The voltage across the resistor is V_R=(2.0V)sin(10^3 rad//s)t : (a) Find the expessinocircuit current (b) Find the inductive reactance (c) derive an expression for the voltage across the inductor,

In a house there are ten 60-watt lamps. Three 40-watt flourorescent tubes and three 40-watt fans. When all these are switched on what is the current drawn from the mains if the supply voltage is 220V? Calculate the power drawn and the cost for using them for 6hours daily in a month of 30 days.( 1 B.O.T. unit costs 30 pasise).

A train of mass 100 tons (1 tons =1000kg) runs on a meter gauge track ( distance between the two rails is 1m) . The coefficient of friction between the rails and the train is 0045 . The train is powered by an electric engine of 90% efficiency. The train is moving with uniform speed of 72 kmph at its highest speed limilt . Horizontal and vertical component of earth's magnetic field and B_(H)=10^(-5)T and B_(V)=2xx10^(-5)T . Assume the body of the train and rails to be perfectly conducting. The electrical power consumed by the trains is

A train of mass 100 tons (1 tons =1000kg) runs on a meter gauge track ( distance between the two rails is 1m) . The coefficient of friction between the rails and the train is 0045 . The train is powered by an electric engine of 90% efficiency. The train is moving with uniform speed of 72 kmph at its highest speed limilt . Horizontal and vertical component of earth's magnetic field and B_(H)=10^(-5)T and B_(V)=2xx10^(-5)T . Assume the body of the train and rails to be perfectly conducting. The potential difference between the two rails is