SOLUTION: The heating element is rated 1.80 kW when operating voltage is 0.24 kV. a)What is the current through it? b)What would its power consumption be if the potential difference drops

Question 407505: The heating element is rated 1.80 kW when operating voltage is 0.24 kV.
a)What is the current through it?
b)What would its power consumption be if the potential difference drops to 0.12 kV?

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
The heating element is rated 1.80 kW when operating voltage is 0.24 kV.
a)What is the current through it?
------------------
P = I*V
1800 = I*240
I = 1800/240 = 7.5 amps
-----------------
b)What would its power consumption be if the potential difference drops to 0.12 kV?
E = I*R
R = E/I = 240/7.5 = 32 ohms
------------
P = E^2/R
@ 120 volts
P = 120^2/32 = 450 watts
RELATED QUESTIONS
An electric radiator which is an ordinary constant resistor emits a heating power of 1.2... (answered by rfadrogane,Alan3354)

There is 1.5 L of water in a kettle on a cooking plate of 2.0 KW. It takes 7 minutes to... (answered by Jk22)

There is 1.5 L of water in a kettle on a cooking plate of 2.0 KW. It takes 7 minutes to... (answered by Alan3354)

The current in a wire varies directly as the voltage and inversely as the resistance.... (answered by jim_thompson5910)

In a circuit, the electric current (in amperes) varies directly as the... (answered by Alan3354)

The electric current I, is amperes, in a circuit varies directly as the voltage V. When... (answered by Boreal,Alan3354)

Electronics, according to Ohm's law, E = IR, where "E" is voltage (measured in volts),... (answered by indra89811)

THE ELECTRIC CURRENT I, IN AMPERES, IN A CIRCUIT VARIES DIRECTLY AS THE VOLTAGE V. WHEN... (answered by stanbon)

The electrical current, in amperes, in a circuit varies directly as the voltage. When 15 (answered by ankor@dixie-net.com)