Question

Three 1.2 ohm lamps are connected in series and connected to a 3 volt battery. Calculate the total current in the circuit

Answer 1

Given

• No. of lamps = 3
• Resistance provided by each lamp = 1.2 Ω
• Voltage= 3 Volt

To find

• Total current in the circuit

concept used :

~Here the concept of Ohm's Law is used. First we will calculate the total resístance offéred by the 3 lamps in series arrangément. Then by using V=IR we will calculate the current.

Solution

First let us calculate the total resistance:-

Resistance in series

$\sf{ \implies R_{total}= 1.2 +1.2 +1.2 }\\ \\\sf{ \implies{\red {R_{total}= 3.6 Ω}}}$

Now according to ohm's law

${ \underline{ \boxed{ \sf{V = IR }}}}$

Where

• v denotes voltage
• I denotes current
• R denotes Resistance

$\sf{ \to \: 3 = I × 3.6} \\ \\ \sf{ \to \: I = \frac{3}{3.6} }\\ \\ \sf{ \to \green{I =0.83 Ampere}}$

So the current flowing through the circuit is 0.83 Ampere

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