An electric heater is rated $1500 \, W$. How much energy does it use in $10$ hours?

What is a watt?

How many watts are there in $1$ horsepower (in $watts$)?

State the relation between $kWh$ and joule. Define $1$ watt.

Calculate the electricity bill amount for the month of April if $4$ bulbs of $40 \, W$ for $5 \, hrs$, $4$ tube lights of $60 \, W$ for $5 \, hrs$, a $TV$ of $100 \, W$ for $6 \, hrs$, and a washing machine of $400 \, W$ for $3 \, hrs$ are used per day. The cost per unit is ₹ $1.80$.

Find the energy in $kWh$ consumed in $10$ hours by four devices of power $500\, W$ each. (in $kWh$)