Final answer:
A magneto ignition switch is connected in parallel to the device represented by R to ensure that both components receive the same voltage from the battery.
Step-by-step explanation:
A magneto ignition switch is connected in parallel to the device represented by R. When components are connected in parallel, they share the same voltage across them.
In the case of a magneto ignition switch, it is connected in parallel to the device represented by R to ensure that both components receive the same voltage from the battery.