How can I switch a 1.5V buzzer with my Arduino? I want to make my alarm clock “smart”. I'm very new to this stuff, that is, the hardware side. The programming shouldn't present too many problems.

I’m currently experimenting with a simulator (http://circuits.io) and want to start with controlling the alarm’s buzzer with my Arduino.

I did some reading on transistors and this is what I came up with:

I’ve turned pin D3 to high and hooked it up to the base of a NPN transistor. I’m trying to run 1.5V through the transistor, but nothing happens. Any thoughts?
You simply need to ground the circuit. In row E on your breadboard just under where you connect the - of the battery, connect that to the ground pin on the UNO. This causes the buzzer to start working.