An oscilloscope is used to measure potential difference (p.d.). The trace with nothing connected to the input is shown. A $1.5\,\text{V}$ d.c. supply is connected to the oscilloscope. The Y-gain is set at $0.5\,\text{V/div}$. The time-base is set at $0.5\,\text{ms/div}$. Which trace shows a supply of $1.5\,\text{V}$ d.c.?
Physics 5054 · O Level · Uses of an oscilloscope