V = E/q
units are volts (V)
Current (I) = rate at which charge travels in a circuit
I = q/t
units are amperes or amps (A)
Resistance (R) = the ratio of applied voltage to the current through the "resistor"
R = V/I
units are ohms (omega symbol)
The relationship that governs all three is the last expression above, often called Ohm's law and expressed typically as:
V = I R
In short:
Voltage is an energy per charge - sort of like the total energy the battery has, but measured as a ratio of energy per coulomb of charge
Current is how "fast" charge travels, but in coulombs per second (amps)
Resistance is how much the resistor "resists", in terms of a ratio: V/I
No comments:
Post a Comment