The current in resistor Y is 0.045 A.
The potential difference across resistor Y is 3.6 V.
Show that the resistance of resistor Y must be about 80 Ω.
Use the equation:
potential difference=current×resistance \text{potential difference} = \text{current} \times \text{resistance} potential difference=current×resistance59 exam-style questions on Edexcel GCSE Physics 10.2 Resistance. Each one has a worked solution and a mark scheme showing where the marks go.