Question

If a toy fan is connected across a battery for 2 minutes and we know that a charge transfer of 120 C takes place then find out the current in the circuit for that period of time.

Answer 1

Let us first understand the concept of zero error and zero correction. While doing the experiment, errors occur sometime. Common sources of error include instrumental, environmental and procedural due to which calculation goes wrong and so the measurement which ruins our efforts. So before doing the experiment it is preferable to check for errors and correction.

Complete step-by-step solution:

So the current I can be calculated as
$I = \dfrac{Q}{t} - - - - - (1)$
where Q is the electric charge transferred through the surface over a time t..
More generally, electric current can be represented as
$I = \dfrac{{dQ}}{{dT}}$
Now using equation (1), we have
$Q = 120 \\\ t = 2 \times 60 seconds$
Substituting the values we get
I = \dfrac{120}{{120}} \\\
$I = 1A$

So the current in the circuit for that period of time is 1 ampere.

Note: There are two types of electric current known as alternating current (AC) and direct current (DC). Direct current is mostly used in low voltage applications such as charging batteries, aircraft applications, etc. Alternating current is used to operate appliances for both household and industrial and commercial use. The conventional direction of an electric current is the direction in which a positive charge would move. So it is directed toward the negative terminal of the battery.