One heater uses 380 W of power when connected by itself to a battery. Another heater uses 280 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

The total power is 161 W

Explanation:

Using the equation bellow we can write the total power delivered to this equivalent resistance

P =

According to this equation, when each heater is connected by itself to the battery, we have

  or

  or

Substituting both equation into the first one

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d) physical means can be used to separate the components of air.