21. Which of the following measures the amount of electricity used in a home or building in a period of time?
A. electric meter
B. gas meter
C. galvanorneter
D. wind vane
22. Which of the following is a safety device that is put in a circuit to connect the parts of the circuit?
A. bulb
B. copper power
C. dry cell
D. switch
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Verified answer
21.A.not sure
22.C.
sana makatulong:)
Answer:
21. A
22. B or D
Explanation:
not sure sa 2nd answer but i hope makatulong : )