An electric motor takes $5\, A$ from a $220\, V$ line. Determine the power of the motor and the energy consumed in $2\, h$.

Which of the following terms does not represent electrical power in a circuit?

An electric lamp of $100 \,\Omega$,a toaster of resistance $50 \,\Omega$,and a water filter of resistance $500 \,\Omega$ are connected in parallel to a $220 \,V$ source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances,and what is the current through it?

Explain the following.
$(a)$ Why are copper and aluminium wires usually employed for electricity transmission?

What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?

Let the resistance of an electrical component remain constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?