Current Electricity and Circuits

Electric current  = 3 A, Resistance  = 10 Ω, Time  = 20 s V = I x R = 3 x 10 = 30 V Heat produced = V x I x t = 30 x 3 x 20 = 1800 J

The charge of an electron is = 1.6 x 10^-19 coulomb i = n x e / t 5 x 10¹⁶ x 1.6 x 10^-19 = 8 x 10^-3. Therefore, charge passes across the section in one second, is 8 x 10^-3 coulomb/60 second = 0.133 mA

Given: i = 3.2 x 10^-3, t = 1, e = 1.6 x 10^-19 i = q / t = ne / t n = it / e = 3.2 x 10^-3 x 1 / 1.6 x 10^-19 = 2 × 10¹⁶

Resistance required in the circuit Rp = V/I = 250 V/ 5 A = 50 Number of resistors connected n = 4 Rp = r / n 50 = r / 4 Therefore, 50 x 4 = 200 ohm

R = V² / P = (110)² / (1300) = 9.3 Ohms

The value of electrical resistance at superconductivity state is 0.

A diode in reverse bias acts as a high-resistance component. This resistance is typically very large, usually in the range of mega ohms.

A voltmeter must be connected in parallel to the two points across which the potential difference is to be measured. This ensures it does not significantly alter the circuit current.

When components are connected end to end in a single path, they are in series. This means the same current flows through each component.

When multiple resistances are connected between the same two points, they are in parallel. This configuration provides multiple paths for the current.

Battery is a combination of two or more cells arranged in series.

the glowing of bulb is the heating effect of electric current. The tungsten filament gets heated up and hence glows.

current = resistance x potential difference

Georg Simon Ohm was a German physicist who discovered the relationship between voltage, current, and resistance, now known as Ohm's Law.