Question

In the adjoining circuit, the reading of the ammeter is
(a) 0.25A
(b) 0.5A
(c) 1.0A
(d) 2.0A​

Answer 1

Answer:

answer will be a or 0.25A

Explanation:

explained already

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Answer 2

The reading of the ammeter is 1.33 A

(1A)

Explanation:

Given Data

In a circuit,

$\text{Resistance R}_1 = 4 \Omega\\\text{Resistance R}_2 = 2 \Omega\\\text{Resistance R}_3 = 2 \Omega$

Voltage (V) = 2 v

Find the reading of the ammeter.

A device which is used to measure the current in an circuit is called as Ammeter. In ammeter the current is measured in Ampere.

$\text{Resistance in parallel (R)} = \text{R}_1 + \text{R}_2$

Resistance in parallel (R) = 4 + 2  

Resistance in parallel (R) = 6 Ω

Resistance in series = 2 Ω

Total Resistance = Resistance in series + Resistance in parallel

$\frac{1}{R} = \frac{1}{\text{R}_\text{series}} + \frac{1}{\text{R}_\text{parallel}}$

$\frac{1}{R} = \frac{1}{2} + \frac{1}{6}$

$\frac{1}{R} = \frac{8}{12}$

$R = \frac{12}{8}$

Total Resistance (R) = 1.5 Ω

By Ohm's law, V = IR

V - voltage and I - Current

Substitute the respective values in above equation

2 = I × 1.5

$\text{I} = \frac{2}{1.5}$

$\text{I} = 1.33$

I = 1.33 = 1 Ampere

Therefore, the reading in the ammeter is 1.33 A (1A) ampere when the total resistance is 1.5 Ω and the voltage is 2v

To Learn More ...

1) Consider the following circuit :

What would be the readings of the ammeter and the voltmeter when key is closed ?Give reason to justify your answers.

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