What charge passes through a 100mA bulb in 2 minutes?

Given:

I = 100 milliamperes – the current passing through the light bulb;

t = 2 minutes – time span.

It is required to determine Q (Coulomb) – the charge that passes through the light bulb for a time interval t.

Let’s convert units of measurement of current strength from milliamperes to amperes:

I = 100 mA = 100 * 10-3 = 0.1 Ampere.

Let’s convert time units from minutes to seconds:

t = 2 minutes = 2 * 60 = 120 seconds.

Then the charge will be equal to:

Q = I * t = 0.1 * 120 = 12 pendant.

Answer: in 2 minutes, a charge equal to 12 Coulomb will pass through the light bulb.