V
valleyboy
Hi all, new here so appologies if this is posted in the wrong section. Also, please bear with me as I am a Mechanical Engineer, not a Electrician/Electrical Engineer. Though I do understand the very basic concepts of electrical circuits and will be able to perform reasonably complex calculations.
I have a H3 automotive headlamp bulb that is part of a flood lamp setup. The bulb is 24Vdc/70W. I need to specify some cable for wiring this, our customer has specified a connector to go on the end that has 22 gauge contacts so I am restricted to 22AWG cable (I'm uncomfortable with this small gauge). Cable length must be 3m long.
I am concerned that the cable is likely to restrict enough current to degrade the performance of the lamp enough for it to be innefective (too dim). Worse still, overheat the cable and cause a fire. So I would like to calculate the current loss of the 22AWG/0.32mmsq cable over its 3m length. Cable resistance is 60ohms/km.
Based on the above information, I have calculated that the lamp will draw 2.92A when in use using the formula A=V/W, is this correct? And do I now have enough info to calculate the current loss?
Could somebody please provide a formula?
Many thanks,
I have a H3 automotive headlamp bulb that is part of a flood lamp setup. The bulb is 24Vdc/70W. I need to specify some cable for wiring this, our customer has specified a connector to go on the end that has 22 gauge contacts so I am restricted to 22AWG cable (I'm uncomfortable with this small gauge). Cable length must be 3m long.
I am concerned that the cable is likely to restrict enough current to degrade the performance of the lamp enough for it to be innefective (too dim). Worse still, overheat the cable and cause a fire. So I would like to calculate the current loss of the 22AWG/0.32mmsq cable over its 3m length. Cable resistance is 60ohms/km.
Based on the above information, I have calculated that the lamp will draw 2.92A when in use using the formula A=V/W, is this correct? And do I now have enough info to calculate the current loss?
Could somebody please provide a formula?
Many thanks,