A computer is being used to sense when a switch changes position. To detect the change in position, the computer needs a potential difference (p.d.) of $0\,\text{V}$ at its input for one switch position and a p.d. between $5\,\text{V}$ and $7\,\text{V}$ for the other switch position. In each circuit, take the battery to have negligible internal resistance. Which circuit gives an input voltage to the computer that allows it to detect the switch’s change of position?
Physics 9702 · AS & A Level · Potential dividers