To provide a variable control to the current

(a)  

Small rechargeable batteries that store amounts of charge in them

(a)  

Can last decades with no signs of dying

(a)  

Changes AC voltage to DC voltage

(a)  

Amplifiers to increase the gain or weak signal

(a)  

Amplify or increased weak signals

(a)  

An electronic device with transistor, diodes, resistor, and capacitors

(a)  

Interrupts current

(a)  

DC power supply with an output voltage of 1.5 volts DC

(a)  

Group of cells connected together to increase the voltage or current output

(a)  

Cuts the circuit from high current

(a)  

Transfers energy from one electric circuit to another

(a)  

Carry low resistance and offer low current losses

(a)  

Coils of wire that are wound around other components

(a)