Using
electricity at such voltages is not safe and hence at the other end, a device
called a transformer lowers the voltage to a value suitable for use 3 10 CELLS, EMF, INTERNAL RESISTANCE
We have already mentioned that a simple device to maintain a steady
current in an electric circuit is the electrolytic cell Basically a cell has
two electrodes, called the positive (P) and the negative (N), as shown in
FIGURE 3