Monday, September 13, 2010

Prelab: Using Voltmeter and Ammeter! :O

Name
Symbol
Unit
Definition
Voltage
V
V
Aka, electrical potential difference is the energy stored when static electric charges are held a certain distance apart. The formula for V is V = E/Q where V is the electric potential difference, in volts, E is the energy required to increase the electric potential of a charge in Joules and Q being the charge itself in coulombs.  Voltage can be measured by the use of a voltmeter.
Current
I
A
The rate of which charge flows past a certain point in a conductor. The current is the movement of electrons, from positive to negative. However, Benjamin Franklin believed that it was actually the movement of positive energy; therefore many physicists based their theories upon the conventional current, Benjamin’s theory of the movement of positive energy. Current can be measured by the use of an ampere. The formula for I is I = Q/t. Where I is the current in amperes, Q is the charge in coulombs, and t is the time in seconds.
Resistance
R
Ω
The electric resistance is the measure of the opposition of the current flow. It was discovered by Georg Ohm and it is measured in the unit Ohm. The formula for resistance is R = V/I, where R is the resistance in ohms, V is the electric potential in volts and I is the electric current in amperes.
Power
E
W
Power is the process of energy transfer from one of its many forms to another. Work is related to electric potential difference or voltage because work is also another term for E, the energy. Therefore, the formula for voltage can be rewritten as W(or E) = V/Q.

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