Q) What is component 4 in figure T1?
A battery stores energy. It is made of one or more electrochemical cells that convert stored chemical energy into electrical energy. Each cell contains a positive terminal (cathode) and a negative terminal (anode). Electrolytes allow ions to move between the electrodes and terminals, which allows current to flow out of the battery to perform work (e.g. powering your ham radio).
Check out NJ2X.COM for other FCC Technician Exam questions related to the schematic symbol.
Written by: NJ2X, Michael Maher