- #1
capthook
- 13
- 0
I'm trying to optimize pulse coils and determine power consumption.
According to Ohm's law:
P = V2/R
where P=power / V=voltage / R=resistance
Why isn't Ohm's law providing the same results as actual meter testing??
Testing coils with 1 "C" battery: 1.5 volts
#1) 2.3 ohm coil: (1.5x1.5)/2.3= .98W
Meter: 1.03V x .43A = .44W
#2) .7 ohm coil: (1.5x1.5)/.7= 3.21W
Meter: .6V x .9A = .54 watts
#3) 2.8 ohm coil: (1.5x1.5)/2.8= .80W
Meter: 1.12V x .42A = .47W
#4) 30.7 ohm coil: (1.5x1.5)/30.7 = .073W
Meter: 1.42V x .044A = .062W
#4 is the only one even CLOSE! #1 and #3 are about half projected, and #2 is off by a MILE!
I'm taking the digital mulimeter readings correctly: volts - across coil ends / amps - inserted into circuit
Why is the actual metered consumption way less than the projected consumption of Ohm's law?![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Thanks!
CH
According to Ohm's law:
P = V2/R
where P=power / V=voltage / R=resistance
Why isn't Ohm's law providing the same results as actual meter testing??
Testing coils with 1 "C" battery: 1.5 volts
#1) 2.3 ohm coil: (1.5x1.5)/2.3= .98W
Meter: 1.03V x .43A = .44W
#2) .7 ohm coil: (1.5x1.5)/.7= 3.21W
Meter: .6V x .9A = .54 watts
#3) 2.8 ohm coil: (1.5x1.5)/2.8= .80W
Meter: 1.12V x .42A = .47W
#4) 30.7 ohm coil: (1.5x1.5)/30.7 = .073W
Meter: 1.42V x .044A = .062W
#4 is the only one even CLOSE! #1 and #3 are about half projected, and #2 is off by a MILE!
I'm taking the digital mulimeter readings correctly: volts - across coil ends / amps - inserted into circuit
Why is the actual metered consumption way less than the projected consumption of Ohm's law?
Thanks!
CH