Power System How do solar panels supply energy for spacecraft?

What's a circuit?

A circuit is a closed loop that electrons can travel in. A source of electricity, such as a battery, provides electrical energy in the circuit.  Unless the circuit is complete, that is, making a full circle back to the electrical source, no electrons will move.

Generally, there is some appliance that uses electricity in the circuit. The appliance may, for example,  provide light or heat or mechanical energy.

What are batteries?
How do solar panels convert the Sun's energy into electricity?

How do batteries work?
What is efficiency?
What's an electron?
What's electron flow?
What is energy?

What's a semiconductor?
Why does electrical current make heat?
What's a resistor?