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Electric Circuit

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Homework Statement



Entrance exam question:
An electric radiator which is an ordinary constant resistor emits a heating power of 750 W at a main supply voltage of 230 V. What is the total heating power in each respective instance when two such radiators are connected a) parallel, and b) in series to the 230 V supply voltage?

Homework Equations



P = VI = I square R = V square divided by R

The Attempt at a Solution



For me, question is unclear!

Edit: is it 1500 W at parallel and 750 W at series? e.g. 115 x 3.2609 = 375 each in series, in parallel 230 x 3.2609 = 750 each?
 
Last edited:

Answers and Replies

  • #2
LowlyPion
Homework Helper
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Homework Statement



Entrance exam question:
An electric radiator which is an ordinary constant resistor emits a heating power of 750 W at a main supply voltage of 230 V. What is the total heating power in each respective instance when two such radiators are connected a) parallel, and b) in series to the 230 V supply voltage?

Homework Equations



P = VI = I square R = V square divided by R

The Attempt at a Solution



For me, question is unclear!

Edit: is it 1500 W at parallel and 750 W at series? e.g. 115 x 3.2609 = 375 each in series, in parallel 230 x 3.2609 = 750 each?
Yes.

P = VI

and V is constant. So if I is double, power is double, etc.
 

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