By means of a relay, a circuit with much more power can be switched with a relatively small current.
Customer reviews about Relay modules
W. Gracht5V Relay module 8 channelsWorks well, with 8 channels there are quite a few options to control devices. The optocouplers keep the signal safely isolated.
DennisSparkFun Qwiic Single RelayHandy module for switching via microcontrollers. Easy to connect with the Qwiic system, without soldering. Works fine via I2C and is reliable under high load.
Jean Magnee12v module relayThe relay works perfectly!!! The connection points (screws) are very useful
Anonymous5V Relay module 2 channelsProduct is exactly as described and works well. Perhaps a small manual could have been included about the inputs (low active) and the jumper for separate power supply.
Tim GTimer relay module - 12VI had a little trouble setting the correct mode, but once you get the hang of how the buttons work, it's pretty easy to operate.