Here we test out our understanding of Ohm's Law by trying to work out the resistance value of the unknown resistors.
Youtube video, suitable whether of not you have the board with you.
See board images.
Tutorial guide for when you have the board with you.
Now it’s your turn to work out the value of the resistors hidden on the board. Try and work out all 4 before having a look. Move the rotary switch to position A and ensure the toggle switch is in the position marked low. When you switch on the board with the other toggle switch, the panel in the top corner will bleep and light up. This is an amazing bit of kit that's wired into the circuit to give us the current and voltage in a digital format.
Now work out the value of the first resistor just divide the voltage by the current. Before doing the same with the other three resistors, flick the toggle switch to high. This will change the voltage in the circuit, you can do the maths again with the new voltage and current and it should give you the same value of resistance. Write down the two values for each resistor before you turn over the flap to check them.
Look at the panel, it's not only telling is the voltage and current but it's being really nice and calculating the number of watts (the wattage) for us as well. Try all the different combinations of the two switches and note the highest number of watts that you get. Now look at the resistors, you will see that they all have 5W written on them meaning that try should be able to handle 5 watts. Some of the values you will record are getting close to that. Now turn the board up-side-down and you will see a bit of metal glued to the bottom of two of the resistors. This is a heatsink and is designed to pull the heat from the resistor and try and ensure it will not over heat.