Question

Fig. 7.1 shows a circuit containing a 12 V power supply, some resistors and an ammeter whose resistance is so small that it may be ignored.

Fig. 7.1
(a) (i) Determine the potential difference across the 2 Ω resistor.
potential difference = ...........................................................[1]
(ii) State the potential difference across the 3 Ω resistor. .................................................. [1]

Answer 1

Below

Step-by-step explanation:

The parallel circuit ( 6 and 3 Ω) have the same voltage applied to EACH them as the series circuit (2 and 4 Ω )

Potential difference across the 3 ohm resistor is just 12 v ( and 12 v for the 6 Ω resistor too)

the 2 and 4Ω resistors split the voltage proportional to their value

the 2 ohm will have 1/2 of the 4 Ω voltage and they add to 12 v

so the 2 Ω voltage will be 4 v ( and the 4 ohm will be 8v)