One heater uses 490 w of power when connected by itself to a battery. another heater uses 250 w of power when connected by itself to the same battery. how much total power do the heaters use when they are both connected in series across the battery?

Power will be 166.66 watt when the heater are connected in series

Explanation:

We have given power of the first heater = 490 watt

And power of the second heater = 250 watt

We know that in series connection potential difference will be same

So let the potential difference is v

Power is given by

So

Similarly

As resistances are connected in series so equivalent resistance

So power