Ohm’s Law and Power Law Applied Ohm’s Law From Wikiversity Reformatted for Powerpoint by Megan Maller
Symbols to Understand n Symbols students must be familiar with: n. V = Voltage n. I = Current n. R = Resistance n. P = Power
Understanding Voltage, Current, Resistance, and Power n. V= Voltage nv = volts n. Voltage is the push of electrons through a wire, and is measured in volts.
Understanding Voltage, Current, Resistance, and Power n. I = Current n. A = amperes n Current is the flow of electrons through a wire, and is measured in amperes.
Understanding Voltage, Current, Resistance, and Power n. R = Resistance n Ohms = Greek letter for omega, Ω. n Resistance slows or resists the electron flow in a wire and is measured in ohms.
Understanding Voltage, Current, Resistance, and Power n n P = Power Watts: a watts is defined as doing work at a rate of one joule per second
Equations of Ohm’s Law n Ohm’s Law is the relationship of voltage, resistance, and current in DC electrical circuits. It requires one volt of “push” to move one ampere of current through one ohm of resistance. n Ohm's law may be rearranged in three ways. It's important to be familiar with each of these. • • • V=Ix. R I=V÷R R = V÷ I
Equations of Power Law n n Power Law describes the relationship between voltage, resistance, and watts. Power’s Law equation is seen as: P=Vx. I also as P = I 2 x R or P = V 2÷R