3 V flashlight, 60 Ω bulb. Current?

Question

3 V flashlight, 60 Ω bulb. Current??  
A. 0.05 A  
B. 0.5 A  
C. 1.8 A  
D. 18 A

Accepted Answer

Correct Answer: (A)0.05 A. 
Rationale: The current in the flashlight circuit is 0.05 A.Electric current is determined by the relationship between voltage, current, and resistance, which is described by Ohm’s law. Ohm’s law states that the current flowing through a conductor is equal to the applied voltage divided by the resistance of the conductor. The relationship used is:current equals voltage divided by resistancewhere current is the flow of electric charge, voltage is the electrical potential difference, and resistance is the opposition to current flow. In this case, the flashlight provides 3 volts and the bulb has a resistance of 60 ohms.A) 0.05 AApplying Ohm’s law gives:current equals 3 volts divided by 60 ohmscurrent equals 0.05 amperesThis calculation correctly uses the given voltage and resistance and produces the correct current.B) 0.5 AThis value results from a decimal-point error, such as dividing 3 by 6 instead of 60. It overestimates the current by a factor of ten.C) 1.8 AThis option comes from inverting the relationship and calculating resistance divided by voltage instead of voltage divided by resistance. Ohm’s law requires voltage to be divided by resistance, not the other way around.D) 18 AThis value reflects a major arithmetic or conceptual error, such as multiplying voltage and resistance or misplacing the decimal by several orders of magnitude. A small flashlight circuit cannot produce such a large current.ConclusionUsing Ohm’s law, the current in a 3-volt circuit with a 60-ohm bulb is found by dividing voltage by resistance. This gives a current of 0.05 amperes.

3 V flashlight, 60 Ω bulb. Current?

A
0.05 A

B
0.5 A

C
1.8 A

D
18 A

The current in the flashlight circuit is 0.05 A.

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3 V flashlight, 60 Ω bulb. Current?

A 0.05 A B 0.5 A C 1.8 A D 18 A

The current in the flashlight circuit is 0.05 A.

Topic Flashcards

Mini Quiz

Related Questions

A
0.05 A

B
0.5 A

C
1.8 A

D
18 A