I(A) = P(W) / V(V)[4] X Research source Or, more simply: Amps = Watts / Volts
PF = P / S[5] X Research source
Vrms = Vpeak / √2 in volts (V) Irms = Ipeak / √2 in amperes (A)
I(A) = P(W) / (PF x V(V) Or, more simply: Amps = watts / (PF x Volts)
Almost everything in your house will be DC. Outlets, light fixtures, and the like are almost always going to be DC. In most countries, the electricity provided by utility mains is AC current (also called alternating current). [7] X Research source AC current can be converted to DC current, but only through the use of a transformer, a rectifier, and a filter. [8] X Research source
The ammeter will not interrupt the flow of electricity, but as current flows through the meter, it will measure the current, causing a reading to display.
V = the potential difference between two points R = the resistance I = the current flowing through the resistance[13] X Research source
Most common cylindrical batteries (AAA through D) provide approximately 1. 5 volts when fresh.
The wiring your electricity flows through will also have resistance. This will likely be negligible, unless the wiring is very poorly manufactured, damaged, or your circuit conducts electricity over a long distance. The formula for resistivity is as follows: Resistance = (resistivity x length)/area[14] X Research source
(V/R1) + (V/R2) + (V/R3), where V represents the total voltage and R represents a resistors resistance in Ohms. [15] X Research source
