Bright Tutorials Bright Tutorials
ICSE Class 10 Physics Question 15 of 27

Solved Sample Paper 1 — Question 27

Back to all questions
27
Question

Question 3(v)

Study the following electric circuit. Find the reading of

(a) the ammeter and

(b) the voltmeter

Study the following electric circuit. Find the reading of (a) the ammeter and (b) the voltmeter. Physics Sample Paper Solved ICSE Class 10.
Answer

(a) In the given circuit, resistances are connected in series, hence, equivalent resistances (Re) = R1 + R2 = 4 + 2 = 6 Ω

Potential difference (V) = 3 V

Current (I) = ?

From Ohm's law

V = IR

Substituting the values in the formula above, we get,

3=I×6⇒I=36⇒I=0.5A3 = I \times 6 \\[0.5em] \Rightarrow I = \dfrac{3}{6} \\[0.5em] \Rightarrow I = 0.5 A

As in series combination, current flowing through each component is same and is equal to the total current flowing in the circuit hence, the reading of ammeter = 0.5 A

(b) Reading of voltmeter = Potential difference across 2 Ω resistor.

Current flowing through bulb = 0.5 A

From Ohm's law

V = IR

Substituting the values in the formula above, we get,

V = 0.5 x 2 = 1 V

Hence, the reading of voltmeter = 1 V