What are the functions of power supply and electrical appliances in the circuit?

What are the functions of power supply and electrical appliances in the circuit?

Power supply is to provide energy (electric energy) for electrical appliances, while electrical appliances are loads, which consume the electric energy provided by power supply

Is current related to power supply or electric appliance
Is it in the same circuit, if you change the specifications of electrical appliances, will the current in the circuit change
I am a student

I=U/R
The current intensity is related to the supply voltage and the resistance of electrical appliances
In the same circuit, it can be seen that in the same power supply, if the specification of electrical appliances is changed (the resistance of electrical appliances is changed), the current in the circuit will change

What kind of device is the power supply in the circuit? What kind of device is the electrical appliance in the circuit?

A power supply is a device in a circuit
An electric appliance is a device that consumes electric energy in a circuit