If a current flowing through a lightbulb is 0.75 ampere and the voltage difference across the lightbulb is 120 volts, how much resistance does the light bulb have

Explanation:

According to Ohm's law:  

Where:  

is the voltage difference across the light bulb

is the resistance of the light bulb   (the value we want to find)

is the electric current

Isolating :  

Finally:

 This is the resistance of the light bulb

the higher the current the higher the mag field around it the higher the influence on the compass

this is an example of "committed" time.

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