$(a)$ Name the instrument/device used to measure electric current in a circuit.
$(b)$ How is an ammeter connected in a circuit to measure current flowing through it ?
$(a)$ $(i)$ What is meant by saying that the potential difference between two points is $1$ volt ?
$(ii)$ How much energy is given to $5$ coulomb of charge passing through a $12 \,V$ battery ?
$(b)$ Describe an activity with necessary electric circuit drawn to study the factors on which the resistance of a conducting wire depends.
A $4\, \Omega$ resistance wire is doubled on itself. Calculate the new resistance of the wire.
An electric heater consumes $1.1 \,kW$ power when $220\, V$ voltage is applied to it. How much current will be flowing through it?
Does an ammeter have a low or a high resistance ?