Poll: I had to think about those…

Thanks for responding!

Here are the answers if you want to double-check you got them right:

1. If you measure the voltage over each of the two components – what’s the sum of the two voltages?

The sum of the voltages over the components in a series circuit always equals the applied battery voltage. That means the sum is 9 volts.

2. If you’re told you have 15 mA of current through the resistor – how much current flows through the LED?

The current in a series circuit is equal everywhere in the circuit, since the current has nowhere else to flow. That means the current through the LED is also 15 mA.

If you need a refresher, you should read this article about Kirchhoff’s laws.