Advertisements
Advertisements
Question
What is the potential difference?
Advertisements
Solution
The potential difference is the difference in the electric potential of two different points.
APPEARS IN
RELATED QUESTIONS
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?
Draw circuit symbols for
a battery of three cells
Draw circuit symbols for
an open switch
Tell the odd one out. Give proper explanation.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator
Observe the following figure which bulb get fuse?

Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.

- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
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.
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 |
Draw a neat diagram showing a closed electric circuit.
Name the instrument used to control current in an electric circuit.
Explain the following:
Open circuit
The unit of electrical power is _______.
Increasing the current passing through the wire decreases the magnetic field intensity.
What is the use of earthing wire?
Rahul wants to make an electric circuit. He has a bulb, two wires, a safety pin, and a piece of copper. He does not have any electric cell or battery. Suddenly he gets some idea. He uses lemon instead of a battery and makes a circuit. Will the bulb glow?
Fuse is
_____ has a thin metallic filament that melts and breaks the connection when the circuit is overheated.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
In a simple circuit, why does the bulb glow when you close the switch?
When a circuit is open, _____ cannot pass through it.
What is the role of the earth wire in domestic circuits?
A device that is used to break an electric circuit is called ______.
Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a positive terminal.
What are the types of electric circuits?
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.

The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
Paheli is running short of connecting wires. To complete an electric circuit, she may use a ______.
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.
Write a short note on the different electrical circuits.
Name the device which is used to measure the strength of the electric current in an electric circuit.
