Simplify the following text for a Grade 9 native English-speaking person.
Original: The cathode-ray oscilloscope works by amplifying the voltage and using it to deflect an electron beam from a straight path , so that the deflection of the beam is proportional to the voltage .
Simplified: The oscilloscope first increases voltage , then the oscilloscope uses the voltage to make the path of electrons bent . Then it uses the idea that the change in direction and the voltage are proportional to find the voltage .