What is meant by an electric circuit ? Draw a circuit diagram to show an electric circuit comprising of a battery of two cells, a resistor, an ammeter and plug key when cirfuit is closed.
Define electric current and state its $SI$ unit. With the help of $Ohm's$ law explain the meaning of $1$ ohm resistance
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.
In a household electric circuit different appliances are connected in parallel to one another. Give two reasons for this. An electrician puts a fuse of rating $5 \,A$ 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 ?
A nichrome wire has a resistance of $10\, \Omega$. Find the resistance of another nichrome wire, whose length is three times and area of cross-section four times the first wire.