Electrical Energy and Changes

We have seen that the use of electrical energy depends on the power range of equipment used. When used together, the great-power electrical equipment requires electrical energy is greater than similar equipment that small helpless.
In addition to relying on electric power, the electrical energy also depends on the length of the equipment used. If the longer the equipment used, the electrical energy required is also greater.
Based on the description above, the electrical energy can be formulated:
W = P × t
since P = V × I, then:
W = V × I × t
Since V = I × R, then the above equation can also be written:
W = I2 × R × t
with W = electrical energy ................................. Joule (J)
P = power .............................................. watt (W)
t = time ........................................... second (s)
I = current strength ...................................... ampere (A)
R = resistance ..................................... ohm (Ω)
For everyday use, the power is usually measured in kilowatts (kW), and the time is measured in hours (hour, abbreviated h). If these units are used, the electrical energy bersatuan kilowatt hours (kWh).
Have you ever watched an electric meter (kWh meter) in your house?
The equipment is used to measure the energy use in your home. Each month PLN officials noted the numbers listed on the kWh meter. Difference in rates registered an electrical energy used in the month. For example, in early April 4216 numbers listed kWh, while the beginning of May 4527 stated kWh. Then the electrical energy that has been used is 4527 kWh - 4216 kWh = 311 kWh. By multiplying that number by the price per kWh, the cost of electricity in your home energy use can be calculated.
The energy that we already know the formula you can use in a variety of things after you convert it into energy in another form.
These changes are as follows.
1. Electrical Energy Light Energy Being Modified
The result of this change you can actually see the light of menyalanya events associated with the electricity network. You can also view various forms of light around you. And the lights are on because of the filament in it, until the lights are on because of the ionic due to potential differences in the hall lamp. Are you still able to give another example?
2. Electrical Energy Being Amended Motion Energy
This process of change can you see when you turn on the fan. Why fans can spin? Fans can spin because of the electrical energy is converted to magnetic components in the fan into the energy of motion.
3. Being Altered Electric Energy Heat Energy
Changes electrical energy into heat energy can you see on household appliances. Iron, electric stove, and solder are examples. This equipment wire harness with resistor types, for example nikelin or nichrome wire. Can you design and create an electric heater? Try to do the following activities.
Designing and Making Electrical Equipment
Tools and materials

    Ø wire nikelin
    Ø ammeters
    Ø voltage source
    Ø voltmeter
    Ø jumper with alligator clip
Safety instructions
Some of rangkaianmu into heat. Do not make short-circuit the positive and negative poles of a voltage source.
Planning an experiment

    As a group, make a deal how the experiment would you do.
    The amount of what you have to change during the experiment?
The amount of what you should measure and how to measure it. Be sure to make the table data.

    Rancanganmu Consult your teacher, and you must include any changes he suggested in rancanganmu.
Analysis and discussion

    How long the effect pemanasmu wire element to electrical energy is needed?
    What are the things that must be added in rancanganmu, so pemanasmu function better?
4. Electrical energy converted into chemical energy
Have you ever seen those "updating" of gold jewelry that they have, such as bracelets, necklaces, and earrings? Such items previously seemed dull, but after the "updated" will turn out to be like new again. This process is commonly known in the community in terms of plating.
Plating utilizing electrical energy changes form into chemical energy through chemical processes. Simply put, the gilding is done by an electric current flows in coating materials (as anode) and jewelry be plated (the cathode) through a liquid electrolyte. During this process metal coating for long run because it will turn into tiny particles are then attached to the plated jewelery. The process of settlement is in need of electrical energy.