Advertisements
Advertisements
प्रश्न
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
Advertisements
उत्तर
For T.V. set: Power = 500 W,
Time = 30 min = 30 × 60 s
∴ Energy = Power × time
E1 = 500 × 30 × 60 = 900 × 103 J
For Heater: Power = 600 W,
Time = 20 min = 20 × 60 s
∴ Energy (E2) = 600 × 20 × 60
= 720 × 103 J
Comparing E1 and E2, E1 > E2
∴ Energy spent by T.V. set (E1) is greater.
The energy consumed by the T.V. set is more than that consumed by the heater.
संबंधित प्रश्न
Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?
What do the following symbols mean in circuit diagrams?
Draw circuit symbols for variable resistance
Draw circuit symbols for
a battery of three cells
Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch the third bulb has its own switch.
How does the short circuit form? What is its effect?
The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.
- By which method are the appliances connected?
- What must be the potential difference across individual appliances?
- Will the current passing through each appliance be the same? Justify your answer.
- Why are the domestic appliances connected in this way?
- If the T.V. stops working, will the other appliances also stop working? Explain your answer.
A battery is to be formed by joining 3 dry cells with connecting wires. Show how will you connect the wires by drawing a diagram.
Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.
Match the column ‘A’ with column ‘B’.
|
Column ‘A’
|
Column ‘B’ |
|
(1) Eka - boron
|
(a) Germanium
|
|
(2) Eka - Aluminium
|
(b) Scandium
|
|
(3) Eka - Silicon
|
(c) Gallium |
What do you understand by the closed electric circuit
Draw a neat diagram showing a open electric circuit.
How much is the potential difference between live and neutral wires?
Increasing the current passing through the wire decreases the magnetic field intensity.
Write scientific reason.
It is beneficial to carry electrical energy in AC form as it is carried over long distances.
Fuse is
_____ has a thin metallic filament that melts and breaks the connection when the circuit is overheated.
What is electric circuit?
In a simple circuit, why does the bulb glow when you close the switch?
The wiring in a house consists of ______ circuits.
Explain about domestic electric circuits. (circuit diagram not required)
The rate of flow of electric charges in a circuit is called ______.
In an electric circuit, the current starts from ______.
Choose the statement which is not correct in the case of an electric fuse.
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
What are the essential components of an electric circuit?
In the following arrangement shown in the following figure, the bulb will not glow if the ends A and B are connected with
Paheli connected two bulbs to a cell as shown in the following figure.
She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.
Boojho has a cell and a single piece of connecting wire. Without cutting the wire in two, will he be able to make the bulb glow? Explain with the help of a circuit diagram.
Write a short note on the different electrical circuits.
An electric motor rated 1100 W is connected to 220 V mains. Find:
- The current drawn from the mains,
- Electric energy consumed if the motor is used for 5 hours daily for 6 days.
- Total cost of energy consumed if the rate of one unit is 5.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
