" 64.Heat produced by a "100" W heater in "2" minutes is "

The heat produced by a 100 W heater in 2 minutes is equal to:

The heat produced by 100W heater in 2 minutes is equal to

The heat produced by a 100 watt heater in 2 minute will be equal to

A 60 W electric bulb connected in series with a room heater is further connected across the mains . If 60 W bulb is now replaced by 100 W bulb , will the heat produced by heater be smaller , remain the same or be larger and why ?

A 50 W bulb is connected in series with a room heater, is connected across that mains. If 50 W bulb is now replaced by 150 W bulb in each of the two cases, will the heat produced by heater by smaller, remain the same or be larger?

A 50 W bulb is connected in parallel with a room heater, is connected across that mains. If 50 W bulb is now replaced by 150 W bulb in each of the two cases, will the heat produced by heater by smaller, remain the same or be larger?

Who will spend more electrical energy ? 500 W TV set in 30 minutes, or 600 W heater in 20 minutes ?