Advertisements
Advertisements
प्रश्न
Three 250 W heaters are connected in parallel to a 100 V supply, Calculate total current taken from the supply.
उत्तर
Total current drawn from the supply
I = I1 + I2 + I3
Since each heater is of 250 W.
Therefore, I1 = I2 = I3
and total current I = 3I,
or I = `3 (250/100)` = 3 (2.5 A) = 7.5 A
APPEARS IN
संबंधित प्रश्न
When a current of 4.0 A passes through a certain resistor for 10 minutes, 2.88 × 104 J of heat are produced. Calculate
the power of the resistor.
the voltage across the resistor.
Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220 V supply line?
(a) 500°C
(b) 1500°C
(c) 2500°C
(d) 4500°C
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
Name the S.I unit of electrical energy. How is it related to Wh?
An electric toaster draws 8 A current in a 220 V circuit. It is used for 2 h. Find the cost of
operating the toaster if the cost of electrical energy is Rs. 4.50 per kWh.
The diagram 31 shows a 3 terminal plug socket.
(i) What is the purpose of the terminal E?
(ii) To which part of the appliance is the terminal E connected?
(iii) To which wire L or N, is the fuse connected and why?
Name the physical quantity which is measured in kW.
An Electric bulb is marked 100 W, 230 V. What how long would this lamp take to consume one unit of electricity?
The resistance of filament of an electric heater is 500 Ω It is operated at 200V for 1 hour daily. Calculate the current drawn by the heater and the energy consumed in kWh, by the heater in a month of 30 days.
An overhead tank of capacity 10 k litre is kept at the top of building 15 m high. Water falls in tank with speed 5`sqrt2` m/s. Water level is at a depth 5 m below ground. The tank is to be filled in `1/2` hr. If efficiency of pump is 67.5% electric power used is ______ W.
