Principle

A commercially available dry battery or single cell is extremely suitable for this experiment on the internal resistance of a source of voltage. It has an internal resistance which is high enough to be measured well, and it can be easily replaced if inattentiveness should cause it to be destroyed by too long exposure to an overload.

The power supply is not suitable for this determination of internal resistance because it is voltage stabilised. 

Benefits

• No additional cable connections between the building blocks needed - clear arragned and quick setup
• Contact saftey due to puzzle blocks system
• Corrosion-free gold plated contacts
• Doubled earning sucess: Electric circuit diagram on top, real components can be seen unterside

Tasks

Do voltage sources also have a resistance?

Connect resistances of various sizes in a circuit, then examine the internal resistance of the voltage source R_i by measuring its current I and terminal voltage U_T.