Electronics & Communication Engineering - Basic Electronics

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25.

What are the unit and symbol for current?                        
A. Ampere, A B. Coulomb, I
C. Ampere, Q D. Ampere, I



26.

Which part of an atom has no electrical charge?                        
A. Electron B. Neutron
C. Proton D. All of the above



27.

Which voltage source converts chemical energy to electrical energy?                        
A. Electrical generator B. Battery
C. Solar cell D. Electronic power supply




28.

An example of potential energy is:                        
A. tea-kettle steam B. a moving vehicle
C. the sun D. a battery



29.

If 40 C of charge flow past a point in 20 s, what is the current?                        
A. 2A B. 0.5A
C. 20A D. 40A



30.

Batteries differ from fuel cells in that                        
A. a battery is a closed system B. a battery uses hydrogen and oxygen to create electricity
C. a battery uses a polymer electrolyte membrane D. none of the above



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