9. How does the electric current move in a circuit?
a. from source to device and back to source
b. from the source to the source and back to the device
c. from source to device and back to the device
d. both a and b
a. from source to device and back to source
b. from the source to the source and back to the device
c. from source to device and back to the device
d. both a and b
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Answer:
D. (both a and b)
Explanation: