Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.
A battery of 12V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.5 Ω and 5 Ω. How much current would flow through the 5-Ω resistor?