I know it is not a maths question, but I couldn't find a physics study group, so: An electric radiator which is an ordinary constant resistor emits a heating power of
750 W at a mains supply voltage of 230 V. What is the total heating power in each respective
instance when two such radiators are connected a) in parallel, and b) in series to the 230 V
supply voltage?
i think i need to find the resistance of radiator first am I right?

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i found the resistance of each radiator to be 70.5333 ohms, but what do I do now?

You're right about the first part.

You next have to set up your circuit where each radiator is represented as a resistor.

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