The teacher of Pradeep's school took the students to the power plant
for an educational tour. The teacher said that in the form of alternating
current, the transmission of electrical energy is done in cities for such
long distances. The alternating current is raised to higher voltages
and the voltages are reduced to operate the devices at receptive
locations in cities. This results in very little loss of energy. Pradeep
listened carefully to the teacher and asked her questions about using
the alternating current in more or less voltage.
() Name the device to convert the alternative voltage to higher or
lower value.
(ii) Mention the causes of power loss in this device.
(ii) Mention the two values displayed by Pradeep and the teacher.
Answers
Answer:
DOWN
Explanation:
The device which is used to change the alternating voltage to a higher or lower value is a Transformer.
Power dissipation in this device can occur due to eddy current loss.
(b) (i) AC is easier to transmit over distance. By stepping the voltage up (and the current down) via a transformer, less power is lost through wire.
(ii) AC also generates lower heat losses because it is only at its peak voltage for a fraction of each alternation of polarity and is also at 0 volts twice during each cycle. Thus it allows the wires to run cooler and waste less power as heat.
(c) Teacher: Concerned, caring, ready to share knowledge.
Geeta: Inquisitive, scientific temper, Good listener, keen learner.
Answer:
1. transformer
2. a) eddy current
b)flux leakage
c) coil resistance
3. a) pradeep is good listener and very attentive
b) teacher is good at teaching student