Question

A 60-V potential different is applied across a parallel combination of a 10-ohm and 20-ohm resistor. What is the current in the 10-ohm resistor? Show your work.

Answer 1

Answer:

(straight out of physics book)

Explanation:

Beats are two tones of slightly different frequency sounded together.  When two slightly mismatched forks are sounded together, beats are heard. Beating in waves is the result of "superposing" - sort of adding together - two waves of different but similar frequencies - eg 50 Hz and 51Hz. The waves go in and out of phase as a sort of continuous or running interference pattern. In the case of sound, you'd hear it as a continuous change in the sound intensity loud in phase, soft out of phase. An example is walking side by side to another person. Sometimes you two will be in the same step and other times you’ll be in different step. If you step 60 times in a minute and your friend takes 63 in that minute, your friend gains three steps per minute on you.  This shows that you two will be in step three times per minute. This goes for forks and frequency as well. When one fork vibrates 242 times per second  and the other 240 per second, they are in step twice each second. This results in 2 hertz beat frequency.

Answer 2

V=IR
60-V
The current that passes through a 10-ohm resistor = I
I=60/10
6 amperes