Which of these labels on an electric device confirms standard quality?

Differentiate between the following.

Heating effect and magnetic effect of current

Name the materials used for making:

(a) heating element of an electric heater

Give reasons for the  following:

Nichrome wire is used as a heating element instead of copper wire.

Observe the given diagram and answer the question that follows.

How is the temperature adjusted when we rotate the knob while using an electric iron on different fabrics? 

Observe the given diagram and answer the question that follows.

What will happen if the brass layer and iron layer is interchanged in their placement in the bimetallic strip? 

Observe the given diagram and answer the question that follows.

Which effect of electricity is used?

An electric oven of $3 \mathrm{kW}$ is connected to the mains of $220 \mathrm{V}$. Calculate:

The amount of energy consumed if the oven is switched on for an hour.