YASH CLASSES
ELECTRIC CURRENT
122. 100 J
of heat are
produced each second
in
a 4Ω
resistance . find the potential
difference across
the resistance .
123. 125 J of heat
are produced each
second
in
a 5 Ω
resistance . find the potential
difference across
the resistance .
124. 800 J of heat
are produced each
second
in
a 25 Ω
resistance . find the potential
difference across
the resistance .
125. 225 J of heat
are produced each
second
in
a 50 Ω
resistance . find the potential
difference across
the resistance .
126. An electric iron
consumes energy at a rate
of
840 W when heating
is at the
maximum
rate
and 360 W when heating is minimum .
The voltage is 220
V . What are the current
and
resistance in each case ?
127. An electric iron consumes
energy at a rate
of
440 W when heating
is at the
maximum
rate
and 360 W when heating is minimum .
The voltage is 220
V . What are the current
and
resistance in each case ?
128. An electric iron consumes
energy at a rate
of
250 W when heating
is at the
maximum
rate
and 300 W when
heating is minimum .
The voltage is 110
V . What are the current
and
resistance in each case ?