Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY ELECTRIC TENSION The causes of movement on free electron and ion to make electric power, positive and negative load in all materials are separated one from the others. This separated load tries to balance itself. The tendency to be balance between different load called electric tension.

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY VOLTAGE Electric tension related to free electron pressure is the cause of the electron movement. The electric tension happens: a.Between over and lack electron part. b.Between more over and less over electron part. c.Between the part that is lack of electron more or less

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY Electricity as power in which is as energy can be produced from other energy. Mechanic energy, chemical energy, heat energy can produce electric energy that can run trough conductor, but not all materials can conduct electricity. Materials which have free electrons inside like metal can conduct electricity but wood which has no free electrons can’t conduct electricity because electricity is energy form that has large uses, so it is needed to understant the characteristic.

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY Conductor connecting poles of electricity source is in the electricity area. Because of this electricity area, free electrons in the conductor move and electric current happens. Electric current which is from element has static direction, that is fromhigh potential pole to low potential pole, meanwhile those are from dynamo, the direction can be static or not. Static direction electric current is called direct current ( DC = direct current ) and the static is called alternative current ( AC = alternative current ).

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY An electrical iron is connected to electricity voltage source. Heater element will heat because it is given electric current from voltage source to heater element. To move electric current, it is needed electric effort:: W = U. Q W = electric effort Wdt (joule) U = electric voltage Volt (V) Q = amount of electric current Coulomb (C)

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY W = U. I. T I = electric current strength Ampere (A) t = time second (dt) W = P. t P = U. I P = electric voltage Watt (w) U = I.R

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY R = electric resistant (Ohm) So : w = I.R. I.T w = I 2.R. T Other electric effort unit : 1 kWh = 1000 Wh = Wdt = 3,6.106 j Conversion of electric effort toward heat effort and mechanic effort: 1 Wdt = 1 joule = 0,24 kal = 0,102 kgm 1 Wh = 3600 j = 864 kal = 267,2 kgm 1 kWh = 3, j = kal = kgm

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY To calculate the price of energy that must be paid that multiply used electric effort and electric rate. B = W. T B = cost W = electric effort kWh T = rate Rp.... / kWh

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY To move an object from one place to other place is needed by mechanic effort. The capacity of mechanic effort depend on object mass and movement distance. W = M. S W = mechanic effort Kg m. M = mass kg. S = distance m.

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY Mechanic effort of each time unit is called mechanical power. it means the bigger power, for same effort, it can be faster done. P = W t P = mechanic effort kg m/second. W = mechanic effort Kg m. t = time second.

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY Another mechanic effort unit : 1 Horse power = 1 Hp = 75 kg m/second On producing electrolyte metal, current that usually runs in the electrolytes cell is determined 8 kA. How many metals are separated out within 24 hours? Problem solving : m = I. t. c m = 8000A. 24 hours. 1,185 g / A hour m = g = 227,5 kg

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY Mechanic Power Conversion That is meant by mechanic power conversion becomes other power which is often used in electrical technique.

Teknologi dan Rekayasa BASIC VOCATIONAL MAINTENANCE BASIC OF MECHANICAL ELECTRICITY back