The illumination of a lamp is directly proportional to the square of the current passing through it, according to Joule's first law. This means that if the current decreases by a certain percentage, the illumination will decrease by the square of that percentage.

Here are the steps to calculate the percentage decrease in illumination:

1. Calculate the square of the percentage decrease in current. In this case, the current drops by 20%, so (20%)^2 = 4%.

2. The illumination of the lamp will decrease by this calculated percentage. So, the illumination of the lamp will decrease by 4%.

Please note that this is a simplified explanation. In reality, the relationship between current and illumination can be affected by other factors such as the type of lamp and its specific electrical characteristics.

Question

The illumination of a lamp is directly proportional to the square of the current passing through it, according to Joule's first law. This means that if the current decreases by a certain percentage, the illumination will decrease by the square of that percentage.

Here are the steps to calculate the percentage decrease in illumination:

1. Calculate the square of the percentage decrease in current. In this case, the current drops by 20%, so (20%)^2 = 4%.

2. The illumination of the lamp will decrease by this calculated percentage. So, the illumination of the lamp will decrease by 4%.

Please note that this is a simplified explanation. In reality, the relationship between current and illumination can be affected by other factors such as the type of lamp and its specific electrical characteristics.

Knowee AI · Accepted Answer

The illumination of a lamp is directly proportional to the square of the current passing through it, according to Joule's first law. This means that if the current decreases by a certain percentage, the illumination will decrease by the square of that percentage.

Here are the steps to calculate the percentage decrease in illumination:

1. Calculate the square of the percentage decrease in current. In this case, the current drops by 20%, so (20%)^2 = 4%.

2. The illumination of the lamp will decrease by this calculated percentage. So, the illumination of the lamp will decrease by 4%.

Please note that this is a simplified explanation. In reality, the relationship between current and illumination can be affected by other factors such as the type of lamp and its specific electrical characteristics.

By what percentage will the illumination of the lamp decrease if the current drops by 20% ?

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By what percentage will the illumination of the lamp decrease if the current drops by 20% ?

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