Question

Define one ohm. A resistance of 6 ohms is connected in series with another resistance of 4 ohms.
A potential difference of 20 volts is applied across the combination.
Calculate the current through the circuit and potential difference across the 6 ohm resistance. [5 MARKS]

Answer 1

Definition: 1 Mark
Problem: 4 Marks

1. For one volt potential difference across a conductor, if current flowing is 1 Ampere resistance of the conductor is 1 ohm.

2.
We use proper symbols for electrical components

Resistance are shown connected in series, with 20 V battery across its positive and negative terminals. Direction of current flow is also shown from positive terminal of the battery towards its negative terminal.

Potential difference, V = 20 V

Potential difference across $6\Omega$

$V_1=?$ (to be calculated)

Total circuit resistance $=10\Omega$

From Ohm's law, $R_s=\frac{V}{R_s}$

Circuit current, I = 2 ampere or (2A)

Putting values, we get, $V_1=2\times 6=12volts$

Potential difference across $6\Omega$ resistance = 12 V