Final answer:
A multimeter will show minimal resistance or beep when in continuity mode if the probes are touching. Using a multimeter in the wrong mode can lead to inaccurate readings or damage the device and circuit.
Step-by-step explanation:
When the two probes of a multimeter make contact with each other while it is set to measure resistance, it will typically display a value close to zero, indicating there is no resistance between the probes. If set to continuity mode, the multimeter may emit a beep, signaling that the circuit is complete. In contrast, if a multimeter is in voltmeter mode and is used to measure current, it may not show an accurate current reading as it's configured to measure potential difference, not current flow.
Moreover, if measuring voltage and the multimeter is accidentally set to ammeter mode, it could potentially cause a short circuit since an ammeter is designed to have minimal resistance and expects to be part of the current path, not across a potential difference. This could damage the multimeter and potentially the circuit being tested.