Circuit Construction Kit DC PhET: Intro

How does adding more batteries in series affect the current in a circuit, and why?

What happens to the brightness of a bulb when you add more resistors in series to the circuit? Explain your observations.

How does the total resistance change when resistors are added in parallel, and how does this affect the current?

How does removing a single resistor in a parallel circuit affect the overall current and resistance in the circuit?

How can you use an ammeter and a voltmeter in the simulation to measure current and voltage in different parts of the circuit?