Question

A thermistor has

a. positive temperature coefficient

b. negative temperature coefficient

c. zero temperature coefficient

d. variable temperature coefficient

answer: c

112. if i, r and t are the current, resistance and time respectively, then according to joule's law heat produced will be proportional to

a. i2rt

b. i2rf

c. i2r2t

d. i2r2t2

answer: a

113. nichrome wire is an alloy of

a. lead and zinc

b. chromium and vanadium

c. nickel and chromium

d. copper and silver

answer: c

114. when a voltage of one volt is applied, a circuit allows one microampere current to flow through it. the conductance of the circuit is

a. 1 micro

Answer 1

???????????? ??? ??????????