Question

HOTS
1) A and B are two devices. Both these devices have two terminals each. If the two terminals of
device A are connected directly by a wire, nothing happens but when the two terminals of device B
are connected by a wire directly, it gets damaged quickly. When the two terminals of device B are
connected to the terminals of device A, by copper wires, then part C of device A gets heated and
glows to produce light.
i. a) What is the device A? __
_b) What is the device B?
ii. Name the part C of device A.
iii. In which device, A or B, the two terminals are marked (+) and (-)?
2) A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder)
and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all.
The student checked the circuit and found that all the wire connections were right.
i. What could be the possible reason for the torch bulb not glowing even when the circuit appears to
be complete?
ii. What could have caused the above condition?​

Answer 1

Answer:

If we join two terminals of electric cell directly through a wire, the chemical in an electric cell get used up very fast and the cell will stop working. Ans: Arrangement that provides a complete path for electricity to pass (current to flow) is known as electric circuit.