The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is
A. zero
B. negative
C. positive
D. about 2 ohms per degree
Answer: C
The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is
A. zero
B. negative
C. positive
D. about 2 ohms per degree
Answer: C