In an electrical circuit three incandescent bulbs $A, B$ and $C$ of rating $40\, W, 60\, W$ and $100 \,W $ respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
Brightness of all the bulbs will be the same
Brightness of bulb $B$ will be more than that of $A$
Brightness of bulb $A$ will be the maximum
Brightness of bulb $C$ will be less than that of $B$
How can we maintain a potential difference across a conductor ?
What is the symbol used to denote ohm?
A piece of wire is redrawn, without change in volume so that its radius is halved. Compare the new resistance with the original resistance.
$(a)$ How much current will an electric bulb draw from a $220\, V$ source, if the resistance of the bulb filament is $1200\,ohm$ ?
$(b)$ How much current will an electric heater coil draw from a $220\, V$ source, if the resistance of the heater coil is $100\, ohm$ ?
In Volta's cell, what is positive electrode (anode) made up of?