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The kilowatt -hour (kWh) is a much larger unit of energy than the joule. There are 3.6×10^6J in a kWh. The kWh is convenient for electrical appliances. a) What is the energy used in operating a 1200W heater for 20 minutes?​

Sagot :

The correct answer is 144 KJ .

Work power, or simply power, is referred to as a physical notion that, depending on the situation and the information at hand, may have a variety of interpretations. The rate of performing labour is referred to as power. Power is defined as the amount of energy used per unit of time. Since it lacks a direction, it is present in scalar amount. Joules/second, or Watt in the SI system, is the unit of power. A watt is the amount of energy required to perform one joule of work in a second.

P = 120 Watts of power

20 minutes plus 60 seconds equals 1200 seconds.

taken t and Energy E= Power P x Time t.

= Work W (or Energy E)/Time

since we know that Power P

Energy E= 120 W x 1200 = 144000 J or 144 KJ

To learn more about power refer the link:

https://brainly.com/question/14070854

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