For a simple circuit You, you are right. Your diagram can run without a ground. Actualy
Actually, when you connect those elements in real word you can measure current and voltage whereever you want so it is legit. But it
The simulator is a software and it is designed to calculate all possible circuits. So, so in some curcits you need a ground to understand the circuit. And concidering
Considering your circuit I can show you en example
Either anode or catode can be grounded right?
Lets assume Wewe put the positive pin of the power source to thegroundthe ground.
The circuit will work fine but there is no point yoyou can measure a positive voltage on the circuit. But, but the physicallphysical reality wontwon't change. (The was ofThat is, the current or heat consumptionproduction or power consumption etc.)
But ifIf the negative pin is grounded Thenthen we can measure positive voltage. But, but everything else remain the same Power consumption heat Current, heat, current and its direction, etc.
As you said it is relative whichrelativ which means Theythey are same if. If you say I am 5 cm more taller than my friend Or or if you say my friend is 5cm shorter than me The.
The software asks you WHich which one do you want me to say So ground.
Ground is Thethe reference point. Where you put the ground will change the sentence and not the results PLease.
Please ask any further questions if you need any more clerifacations.