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Electronics
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Voltage and Current
Comments
Question
If 40 C of charge flow past a point in 20 s, what is the current?
Options
A. 2 A
B. 0.5 A
C. 20 A
D. 40 A
Correct Answer
2 A
Voltage and Current problems
Search Results
1. Current is:
Options
A. the presence of a positive charge
B. the abundance of electrons
C. the movement of electrons
D. the repulsion of electrons
Show Answer
Scratch Pad
Discuss
Correct Answer: the movement of electrons
2. Primary batteries, unlike secondary batteries, may be:
Options
A. charged once
B. used once
C. recharged over and over
D. stored indefinitely
Show Answer
Scratch Pad
Discuss
Correct Answer: used once
Explanation:
Primary batteries (disposable batteries), which are designed to be used once and discarded when they are exhausted.
Secondary batteries (rechargeable batteries), which are designed to be recharged and used multiple times.
3. The basic difference between a fuse and a circuit breaker is
Options
A. a fuse is slower
B. a fuse is reusable
C. a circuit breaker is reusable
D. a circuit breaker is more reliable
Show Answer
Scratch Pad
Discuss
Correct Answer: a circuit breaker is reusable
4. Current is considered as the movement of:
Options
A. electrons
B. protons
C. charge
D. nuclei
Show Answer
Scratch Pad
Discuss
Correct Answer: electrons
5. In practical applications, battery voltage:
Options
A. is restored as soon as disconnect occurs
B. is lowered as the load increases
C. may be stored indefinitely
D. will be reduced to zero as power is drawn
Show Answer
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Discuss
Correct Answer: is lowered as the load increases
6. What is the name of the pressure that moves electrons in a closed circuit?
Options
A. amperes
B. ohms
C. voltage
D. coulombs
Show Answer
Scratch Pad
Discuss
Correct Answer: voltage
7. Current equals:
Options
A.
B. coulombs × time
C.
D. voltage × time
Show Answer
Scratch Pad
Discuss
Correct Answer:
8. What type of switch is this?
Options
A. push button
B. SPST
C. DPDT
D. SPDT
Show Answer
Scratch Pad
Discuss
Correct Answer: SPDT
9. A lead-acid battery is an example of a
Options
A. solar cell
B. fuel cell
C. primary battery
D. secondary battery
Show Answer
Scratch Pad
Discuss
Correct Answer: secondary battery
10. A voltage will influence current only if the circuit is:
Options
A. open
B. insulated
C. high resistance
D. closed
Show Answer
Scratch Pad
Discuss
Correct Answer: closed
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Voltage and Current
