When the $200\,\Omega$ voltmeter is connected in parallel with the $200\,\Omega$ resistor, their equivalent parallel resistance is:
$$R_p = \frac{200 \times 200}{200 + 200} = \frac{40000}{400} = 100\,\Omega$$Now, the total resistance of the entire circuit is:
$$R_{\text{total}} = 100\,\Omega + R_p = 100 + 100 = 200\,\Omega$$The total current drawn from the $20\,\text{V}$ battery is:
$$I = \frac{V}{R_{\text{total}}} = \frac{20\,\text{V}}{200\,\Omega} = 0.1\,\text{A}$$The potential difference across the parallel combination (which is the voltmeter reading) is:
$$V_{\text{voltmeter}} = I \times R_p = 0.1\,\text{A} \times 100\,\Omega = 10\,\text{V}$$जब $200\,\Omega$ के वोल्टमीटर को $200\,\Omega$ के प्रतिरोधक के समानांतर जोड़ा जाता है, तो उनका तुल्य प्रतिरोध निम्न होता है:
$$R_p = \frac{200 \times 200}{200 + 200} = 100\,\Omega$$परिपथ का कुल प्रतिरोध:
$$R_{\text{total}} = 100 + 100 = 200\,\Omega$$बैटरी ($20\,\text{V}$) से प्रवाहित कुल धारा:
$$I = \frac{20}{200} = 0.1\,\text{A}$$