R: It melts and breaks the circuit if the current exceeds a certain value.
A. R does not explain A
B. R explains A
C. A is correct, R is wrong
D. Both A and R are wrong
Answer:B
R: It melts and breaks the circuit if the current exceeds a certain value.
A. R does not explain A B. R explains A C. A is correct, R is wrong D. Both A and R are wrong