If the current $I $ through a resistor is increased by $100\%$ (assume that temperature remains unchanged), the increase in power dissipated will be ........ $\%$

What is the resistance of an ideal voltmeter ?

Define electric current and state its $SI$ unit. With the help of $Ohm's$ law explain the meaning of $1$ ohm resistance

Why do we use copper and aluminium wire for transmission of electric current ?

$(a)$ Why is the series arrangement not used for domestic circuits ?

$(b)$ Why is the tungsten used almost exclusively for filament of electric lamps ?

$(c)$ Why are the conductors of electric heating devices such as bread toasters and electric irons made of an alloy rather than a pure metal ?

$(d)$ Why are copper and aluminium wires usually employed for electricity transmission ?

(e) Why does the cord of an electric heater not glow while the heating element does ?

$(i)$ Name and state the law that gives relationship between the current through a conductor and the potential difference across its two terminals. Also, express this law mathematically.

$(ii)$ Draw the $V-I$ graph for this law. Justify your answer.

$(iii)$ Write the name and use of the circuit components whose symbols are given below.