by 
Thommy
ANSWERS: 2
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Voltage measures electrical pressure/electrical potential difference in volts. Resistance measures resistance to electrical pressure. Resistance can be measured in Ohms. Ampage measures eletrical current in amps. Current through a resistance is proportional to potential difference divided by the resistance. Amps = Voltage / Resistance in Ohms. (more resistance = less current, more voltage = more current) Wattage measures power in Watts. Power is energy consumption per given time. Joules consumed in a second in the case of Watts. Electrical consumption in a component in watts is equal to voltage multipied by the ampage through it. Thus a 55 Watt light bulb on a 110 Volt circuit draws a current of half an Amp and has a resistance of 220 Ohms.
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A voltage between two ends says i have so much static pressure between me so when connected by a wire it will result in a current. Resistance of a conductor (through which the current flows) says you may have the pressure but i will decide how much current will flow, meaning it resists the flow of current. Lesser the resistance more the current. I(current) = V(Voltage)/R(Resistance). Because of the resistance and conservation of energy, the lost energy (that was suppose to be converted into electric flow) comes as heat. So the energy consumed for given time will be in Watts (W = Voltage x current = Voltage * Voltage/Resistance = V*V/R), so some of the resistors are designed for a particular wattage. As the resistance of a resistor is constant Wattage is directly proportional to the square of voltage. If you keep on increasing the voltage resitance cannot take all that energy getting converted into heat and burns out, so usually resistance comes with safe maximum operating Voltage/Wattage.
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