How does the heat H produced by a current passing through a fixed resistance wire depend on the magnitude of current I?

An electric bulb is rated as 10 W, 220V. How many of these bulbs can be connected in parallel across the two wires of 220 V supply line if the maximum current which can be drawn in 5A ?

Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220 V supply line one by one, what will be the ratio of electric power consumed by them?

If the current passing through a conductor is doubled, what will be the change in heat produced?

Name two effects produced by electric current.