Electrophysiology is the measurement of the electrical activity, or “excitability”, of biological cells (be they muscle cells, neurons, or stem cells). This can be done at a single-cell level, or it ...

When resistors are connected in parallel, the supply current is equal to the sum of the currents through each resistor. In other words the currents in the branches of a parallel circuit add up to the ...

This equation can be used to calculate what the output might be from a particular transformer, or to work out how to design a transformer to make a particular potential difference change: ...