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Lunna [17]
2 years ago
8

Which of these is an example of a chemical change?

Physics
2 answers:
nadya68 [22]2 years ago
6 0
1 - fireworks exploding
lora16 [44]2 years ago
3 0

Answer:

Fireworks Exploding

Explanation:

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Answer:

The resistance that will provide this potential drop is 388.89 ohms.

Explanation:

Given;

Voltage source, E = 12 V

Voltage rating of the lamp, V = 5 V

Current through the lamp, I = 18 mA

Extra voltage or potential drop, IR =  E- V  

                                                    IR = 12 V - 5 V = 7 V

The resistance that will provide this potential drop (7 V) is calculated as follows:

IR = V

R = \frac{V}{I} = \frac{7 \ V}{18 \times 10^{-3} A} \ = 388.89 \ ohms

Therefore, the resistance that will provide this potential drop is 388.89 ohms.

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