Resistance Of A 12 Volt 21 Watt Bulb

12 volts and 21 watts.

Resistance of a 12 volt 21 watt bulb.

According to watts law power p i v. These differ from the first set by a factor of 10. Looking in maplin most resistors seem to be designated in watts or ohms watts which has got me really confused. Technician b says that a motor that has 1 ohm of resistance has a power rating of 144 watts if it is connected to a 12 volt battery.

Voltage e current i resistance r. I am pretty sure my meter is giving me the correct reading and that i am using it correctly. Enter 100 in the watts field and 120 in the voltage field and press calculate to find the resistance and current. In theory the formula v ir i is current 12 55 or approximately 0 2 ohms.

Resistance voltage current. Technician a says that a 12 volt light bulb that draws 12 amps has a power output of 1 watt. 12v led light bulb 7w 630lm ac dc 12 volt low voltage e26 base 2700k warm white 40 60 watt a19 bulbs equivalent landscape garden yard 12volt battery power system off grid solar lighting 6 pack 4 7 out of 5 stars 192. Looking for a resistor to mimic a 12v 21w bulb car with an indicator flasher unit designed for 2 x 21w 5w but only using 1 x 21w 1 x 5w trying to remember my o level physics i worked out that current would be 1 75a and therefore resistance would be roughly 7ohms.

55 miniature bulb ba9s base 7 0 volt 41 amp 2 87 watt g4 1 2 ba9s base 500 hour 921 w16w miniature bulb glass wedge base 12 8 volt 1 40 amp 17 92 watt t5 glass wedge base 1 000 hour 912 miniature bulb glass wedge base 2826 miniature bulb glass wedge base. The resistance of the bulb is 12 v 1 75 a 6 86 ω. Fields should be reset to 0 before each new calculation. For example a 100 watt light bulb operating on 120 volts ac will have 144 ohms of resistance and will draw 0 833 amps.

However if i use r volts squared watts 5 watt bulb 28 8 ohms 6 watt bulb 24 ohms 10 watt bulb 14 4 ohms. 2821 w3w miniature bulb glass wedge base 12 volt 0 25 amp 3 watt t3 1 4 miniature wedge base 1 000 hour 1034a amber miniature bulb bay15d base 12 8 14 0 volt 1 80 0 59 amp 23 8 26 watt painted amber s8 dc index bayonet base 200 5000 hour. I will assume this a dc application. V voltage and.

According to ohm s law i v r. But in reality the resistance probably will go to infinity as that much current would almost certainly blow the filament. 21 w 12 v x current. Current 21 w 12 v 1 75 amps.