Power Loss in Transmission

Q.

The mains supply of a house is through a 2A fuse. How many 50W bulbs can be used in this house at the normal voltage.

Q. Power losses in transmission lines occur due to heating. This is calculated using the formula : ___

1. $I^{2}R$
2. $\frac{I^2}{R}$
3. $\frac{I}{R}$
4. $V^{2}R$

Q.

An air conditioner rating 2000w;220v is operated a domestic circuit of rrow that has different rating of 5A. What result do you expect?

Q.

What do the following units measure: volt; coulomb; watt and kilowatt hour

1. volt → power

   coulomb → Electric charge

   watt → Potential difference

   kilowatt hour → Electrical energy

2. volt → Potential difference

   coulomb → Electric charge

   watt → power

   kilowatt hour → Electrical energy

3. watt → Potential difference

   Coulomb → Electrical energy

   volt → power

   kilowatt hour → Electric charge

4. volt → Potential difference

   coulomb → power

   watt → Electric charge

   kilowatt hour → Electrical energy

Q.

Three appliances are connected in parallel to the same source which provides a voltage of 220 V. A fuse connected to the source will blow if the current from the source exceeds 10 A. If the the three appliances are rated at 60 W, 500 W and 1200 W at 220 V, will the fuse blow ?

Q. Power is transmitted across large distances through wires having ___ current and ___voltage.

1. low, low
2. high, low
3. low, high
4. high, high

Q.

Differentiate between. (1) electric potential and electric potential energy

(2) kilowatt and kilowatt hour .

Q.

Out of three fuses available, with a current ratings 5 A, 10 A, and 13 A, which one should be used in a circuit, containing a geyser, rated 3 kW-250 V? Give one reason.

Q. Power losses in transmission lines occur due to heating. This is calculated using the formula : ___

1. $I^{2}R$
2. $V^{2}R$
3. $\frac{I}{R}$
4. $\frac{I^2}{R}$

Q.

An electric kettle takes a 4A current at 220V . How much time will it take to boil 1kg of water from temperature 20degrees C? The temperature of boiling water is 100degrees C.

1- 4.2min 2- 6.3 min

3- 8.4 min 4- 12.6 min

Q. How many 60 W lamps may be safely run on a 230 V circuit fitted with a 5 A fuse?

1. 2
2. 19
3. 20
4. 4

Q.

Electric supply of a house is through a $10A$ fuse. When a $2000W$ heater is used in this house, how many $100W$ bulbs can be used simultaneously? The supply is at $220V$, and the heater and the bulbs are rated for $220V$.

1. 2

2. 3

3. 4

4. 5

Q. Electric supply of a house is through a 15 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously ? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.

1. 12
2. 14
3. 15
4. 13

Q. Electric supply of a house is through a 15 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously ? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.

1. 12
2. 13
3. 14
4. 15

Q.

Power is transmitted across large distances through wires having ______ current and ______ voltage.

1. high, low

2. low, high

3. high, high

4. low, low

Q. Power is transmitted across large distances through wires having ___ current and ___voltage.

1. low, low
2. high, low
3. low, high
4. high, high

Q.

Kilowatt-hour is the unit of :

1. electric energy

2. electric power

3. electric charge

4. electric current

Q. A heater joined in parallel with a 60 watt bulb is connected to the mains. If the 60 watt bulb is replaced by a 100 watt bulb, will the rate of heat produced by the heater remain the same in comparison to the first case? Do not reject it

Q. Electric supply of a house is through a 10 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.

1. $2$
2. $3$
3. $4$
4. $5$

Q. Consider the situation shown in figure (31-E23). The switch S is open for a long time and then closed. (a) Find the charge flown through the battery when the switch S is closed. (b) Find the work done by the battery.

Figure

(c) Find the change in energy stored in the capacitors.
(d) Find the heat developed in the system.

Q. Electric supply of a house is through a 15 A fuse. When a 2000 W heater is used in this house, how many 100 W bulbs can be used simultaneously ? The supply is at 220 V, and the heater and the bulbs are rated for 220 V.

1. 12
2. 13
3. 14
4. 15

Q. Kilowatt-hour is the unit of:

1. Voltage
2. Potential difference
3. Electric charge
4. Electrical energy

Q. a electric kttle consumes 1 kW of electric power when operated

at 220 V. A fuse wire of what rating must be used for it?