What is the resistance of an ideal ammeter?

What is meant by equivalent resistance?

Elements of electric toasters and electric irons are made of an alloy rather than a pure metal. Give two reasons to justify the statement.

If three bulbs of $100 \; W$, $60 \; W$, and $40 \; W$ are used for $2 \; \text{hours}$ daily in a house, how many units of electrical energy are consumed in $30 \; \text{days}$?

An electric iron draws a current of $0.5\, A$ when the voltage is $200\, V$. Calculate the amount of electric charge flowing through it in one hour. (in $C$)

How can we maintain a potential difference across a conductor?