current consumption

how can i know current consumption of motor and bluetooth? bcoz when i am connecting power supply to leonardo board bluetooth is getting disconnected . so i want to know how much current bluetooth taking?

-Look at that modules datasheet

-use a multimeter, set it to current function and measure the current draw.

I dont think an arduino can power motors

Motor will take many orders of magnitude more power than Bluetooth.

Yes, you cannot power motors from an Arduino, it will cause damage to the Arduino. That's why
motor shields and motor drivers exist.

Never power a motor from a logic supply, it may damage all the logic chips on the supply, it
probably will reset them all even if it doesn't damage them.

basically i made a obstacle detection car using ir sensor ,yes i am using proper driver IC ,and when it start working automatically bluetooth is getting disconnected ,so i now i am using 5v 3a power supply but after using this also it get disconnected after some time