Electric socks, popular in cold weather, have a 90 ohms heating element that is powered by a 9 V
battery. If the socks are on for 3 minutes (180 seconds), determine the amount of current used
to warm your feet while it is on.

Answer : The amount of current used  to warm your feet is, 0.1 A

Explanation :

To calculate the current we are using ohm's law:

where,

V = voltage = 9 V

I = current = ?

R = resistance = 90 Ω

Now put all the given values in the above formula, we get the current.

Therefore, the amount of current used  to warm your feet is, 0.1 A

conduction, convection, radiation

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