Electrical Energy and Power (Wrong because of decimal place)

In summary, electrical energy is the amount of energy consumed or produced by an electrical circuit over a period of time, while power is the rate at which energy is transferred or used. Electrical energy is typically measured in joules or kilowatt-hours, and the relationship between electrical energy and power is described by the equation P = E/t. Electrical energy can be converted into other forms of energy, and understanding it is important for efficient and safe use of electricity.
  • #1
AznBoi
471
0

Homework Statement


How much does it cost to watch a complete 21-hour-long World Series on a 180-W television set? Assume that electricity costs $0.070/kWh

The Attempt at a Solution



[tex] \frac {0.070}{kWh} = \frac {x}{(180*10^{3}kW)(21h)}[/tex]

[tex] \frac {0.070*(180*10^3 kW)(21h)}{kWh} = x [/tex]

I got $264,600 when the answer is suppose to be 26 cents. What am I doing wrong here? Thanks.
 
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  • #2
Why do you have 180*[tex]10^3[/tex]kW?
 
  • #3
Yes, you've converted your power the wrong way.
 

1. What is the difference between electrical energy and power?

Electrical energy refers to the amount of energy that is consumed or produced by an electrical circuit over a period of time. Power, on the other hand, is the rate at which energy is transferred or used, and is measured in watts.

2. How is electrical energy measured?

Electrical energy is typically measured in units of joules (J) or kilowatt-hours (kWh). Joules are used to measure the amount of energy used or produced in a single event, while kilowatt-hours are used to measure the total amount of energy used over a period of time.

3. What is the relationship between electrical energy and power?

The relationship between electrical energy and power is described by the equation: Power (P) = Energy (E) / Time (t). This means that power is directly proportional to energy, and the more power that is used or produced, the more energy is consumed or produced over a period of time.

4. Can electrical energy be converted into other forms of energy?

Yes, electrical energy can be converted into other forms of energy, such as mechanical energy, thermal energy, or light energy. This is the basis of many electrical devices and appliances, which convert electrical energy into the desired form of energy for their specific function.

5. What is the importance of understanding electrical energy and power?

Understanding electrical energy and power is crucial for the proper use and management of electricity. It allows us to make informed decisions about energy consumption, efficiency, and safety. It also enables us to design and use electrical systems and devices effectively and responsibly.

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