What do the following circuit symbols represent?

i. In a household electric circuit different appliances are connected in parallel to one another. Give two reasons.

ii. An electrician puts a fuse of rating 5A in that part of domestic electrical circuit in which an electrical heater of rating 1.5 kW, 220 V is operating. What is likely to happen in this case and why? What change, if any, needs to be made?

Suppose the ammeter you are using in this experiment does not have positive and negative markings , How will you use such ammeter?

The circuit diagram is for a fan dryer that blows either hot air of cold air. Both switches R and S are as shown often. Which switch (s) is/are to be closed to obtain either hot or cold air?

(i) Define the term ‘volt’.

(ii) State the relation between work, charge and potential difference for an electric circuit. Calculate the potential difference between the two terminals of a battery if 100 joules of work is required to transfer 20 coulombs of charge from one terminal of the battery to the other.

OR

(i) Define the term ‘coulomb’.

(ii) State the relationship between the electric current, the charge moving through a conductor and the time of flow.

Calculate the charge is passing through an electric bulb in 20 minutes if the value of current is 200 mA.

Suppose the deflection go beyond the full scale. What will you infer from such observation?

While taking the reading the student observe that pointer on voltmeter is 15th division when voltmeter least count is 0.05V. Find the observed reading of voltmeter?

What is the difference between voltmeter & ammeter?

Why it is advised to clean the ends of connecting wires before connecting them?