can someone explain why we are adding 4 to pc I have seen pc + 2 before so I am wondering how we determine what integer to add to pv obviously it has to do with what instruction we are given but I need some dots connected thanks.

A mov assembly instruction copies the value of the source register to the destination register. What is the value of the destination register r1 after the following instruction completes? 4- Memory Address Assembly Instruction 0x08000166MoV rl, pc R1-pc 4 0x08000166 +4 0x0800016A