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#13288
Susan BrownSusan Brown
Keymaster

First of all, what do you think the answer is to #9?

For #7:
You are mixing up different electrical properties.

Resistance, R, is in ohms.
Voltage, E (or V) is volts.
Heat is power, P, in watts.

120v – 37 ohms = 83 watts doesn’t make sense.

Rewatch the video about the heat generated by the loose connection at the end of Unit 3. It’s a similar scenario, with two resistances in series.

The first step is to calculate the circuit current. (Remember that current will be the same throughout a series circuit, and is determined by the supply voltage and the total resistance in the circuit.)

The second step is to use that current as part of the calculation of P for the loose connection.