Well done, that sounds right to me
Just occurred to me that you've recently been doing transformers and power supplies... might be worth mentioning that potential dividers (also know as voltage dividers) like this aren't useful as power supplies. usually you'll see them drawn with a volt meter across the output or with the output just left unconnected.
They are really useful for producing a signal voltage. e.g. in the last diagram Vout would be a signal voltage indicating the amount of light falling on the LDR
...But if you try take a significant amount of power out through at Vout by putting a lightbulb or similar load there, you mess up the potential divider effect... some current is going out into your load, so there is now a difference between the current through the top and bottom resistors.
it's OK to put Vout across a Voltmeter or an oscilloscope (or another instrument) which has very high resistances and don't cause the current in the top resistor to change significantly.
They're for making voltage measurements with, not supplying power.
hope this hasn't added confusion
- I remember I got taught potential dividers and power supplies at the same time and tbh I don't think it was explained sufficiently that they're not supposed to do the same job as each other... and IIRC it took some struggle to figure that out myself.