Current of 2.4 V 1.68 W DC light bulb connected to 2.4 V DC regulated source

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hey guys, i know theese questions may be a bit silly but i always have problems with the answers.

When a small 1.68 W DC light bulb rated at 2.4 V is connected to 2.4 V DC regulated source what will be the current through it? is it .7 A?

Can this lightbulb be modeled as a resistor? how about a dc motor?
 

Re: simple question

1.68 W is the amount of power consumed when 2.4V is applied across this bulb. So, the current should be 0.7A.

Ofcourse, as this is a constant DC bulb, using an inductor in its model would be useless, b/c it would behave as a short-ckt for a steady DC voltage.

Thus, the bulb CAN indeed be modelled with a single resistor.

Same is the case with a DC motor...i.e. a number of resistors are needed to model different things.

HOPE THIS HELPS!
 

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