Question

10. A student wants to conduct an experiment using an electric circuit. He wants to reduce the risk involved in the procedure. Which of these methods should he adopt to reduce the risk involved in an electric circuit?
(a) Use electricity from mains
(b) Use an inverter for electricity
(c) Use a generator for electricity
(d) Use electric cells for electricity​

Answer 1

Answer:

Now first of all you need get the least count of both meters.

Then add as many least counts as needed to add up to the point where needle coincides.

Its is a little about measurement & error

Just subtract the initial reading of the open circuit to the reading when u perform experiment.

Actual reading = Final reading - Initial reading

Answer 2

Answer:

He should use electric cells to reduce the risk. Option (d) is correct.

Explanation:

• Generators are complex, heavy-duty, high-powered machines that use mechanical energy from external sources and convert them into electrical energy and generate electricity.
• Inverters are low-power devices that draw power from a non-invasive DC source and use a microprocessor to convert DC power into AC power.
• The cell converts chemical energy into electrical energy and produces dc current only.

Electric shock has the potential to cause ventricular fibrillation which can lead to heart failure and death. Avoiding any kind of electrical shock is best, but DC is considered safe in these situations as the human body limit at DC is much higher than AC.

So, he should use electric cells to reduce the risk.

Option (d) is correct.