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Anonymous users2024-02-11To understand a similar problem, we must first understand a formula: that is, p=u2 r, that is, the square of the power p=voltage u, divided by the resistance r.
Let me help you deduce this formula, first of all, to understand two formulas:
The first: Ohm's law i = u r, where i is the current, u is the voltage, and r is the resistance.
The second: the law of power: p = ui, where p is the power, u is the voltage, and i is the current.
Then substituting i=u r into p=ui gives p=u 2 r, that is, the square of the power p=voltage u divided by the resistance r.
Knowing this electrical work formula, i.e., p=u2r, that is, the power p=voltage u, squared divided by the resistance r, let's look at the two questions you asked:
First of all, analyze the known conditions: the rated power p=60w (w is the power unit watt) and the rated voltage u=110v (v is the voltage unit volt), then the resistance r=u 2 p=(220) 2 60 about = oh can be deduced from p=u 2 r.
Question 1: The actual voltage at both ends of the bulb is U=110V, and the power p is found.
From the formula introduced above: p=u 2 r=(110) 2
Question 2: The actual power is 30W, find the actual voltage.
From the formula introduced above: p=u2r deduces u=pr, i.e., pr=open-square(30*approx.=) under the root number
If you want to help, if you have any questions, please feel free to ask, and we are willing to help you answer them wholeheartedly.
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Anonymous users2024-02-10w=u2 r Because r does not change, the actual power of the bulb w1=(
w1=u1 2 r=30 60w= so u1 2=so u1=
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Anonymous users2024-02-09First find the resistance U2 r=p, bring in u=220V, p=60w to get the resistance to be ohms.
2) Presquare (30*.)
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Anonymous users2024-02-081-15%), the bath x is equal to.
85% x equals.
That is, the embedding is higher than the bend.
x is equal to divide.
x is equal to 2
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Anonymous users2024-02-0785 percent x = x = divided by 85 percent x = 2
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Anonymous users2024-02-06Two cases: the waist is 3 longer than the bottom and the bottom is 3 longer than the waist
1. If the waist length is x, the bottom edge of the defeat length is x-3
2x+x-3=21
3x=24x=8
Bottom edge trapped long = 8-3 = 5
2. If the waist length is x, the bottom length is the ruler tremor x+3
2x+x+3=21
3x=18x=6
Base edge length = 6 + 3 = 9
Solution: (sin -sin ) =sin -2sin sin +sin =3 4
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