modified 11 years ago

Current in light bulb

00:28:52

Guys, please, tell me how to calculate current in wire, of light bulb? Amplitude is 230V, max power of bulb is 100W. What I need to calculate? Effective current or maximal current? If all is good, I got 454mA, by Pm=Um*Im

published 11 years ago

lmccoig

11 years ago

Power in watts = E x I. 100 watt bulb= 220 volts times I (current) or 100/ 220= .4545 amp. As shown in display wave readout. Cold light filiment read with ohm meter is different from operating temperature resistance.

milosb793

11 years ago

Thank you for respond. I tried to read a resistance by Ohm meter, so value is 38ohms.

lmccoig

11 years ago

Operating temperature calculation E= I times R or 220/ .4545 = 484 Ohms.

milosb793

11 years ago

Got it. Thank you!

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