(a)
the resistance of the light string.
(a)
Answer to Problem 63A
The total resistance of the light string is 225
Explanation of Solution
Given:
Total power dissipation is
Formula used:
Total power dissipation can be found by using formula
Here,
Calculation:
Rearrange the equation (1) for R,
Substitute the values of
Conclusion:
Hence, the total resistance of the light string is 225
(b)
the power used by string.
(b)
Answer to Problem 63A
The resistance of a single light will be
Explanation of Solution
Given:
Total power dissipation is
Formula used:
Total power dissipation can be found by using formula
Here,
Calculation:
It is given that, the light string is made of 18 identical lights connected in series.
In series circuit, the equivalent resistance is the sum of the resistance of the entire resistor connected in it. Since, the light are identical the resistance of the entire 18 resistor will be same.
Therefore, the resistance of a single light will be
Conclusion:
Hence, the resistance of a single light will be
(c)
whether power decreases or increases when the bulb burned out.
(c)
Answer to Problem 63A
The power will decrease.
Explanation of Solution
Given:
Total power dissipation is
Resistance of a single light is
Formula used:
Power can be expressed as
Current can be expressed as
Calculation:
Substitute the values,
The current in the circuit is 0.533 A.
Now, substitute the values of
Since this power is less than the total power, so power will decrease.
Conclusion:
Hence, the power will decrease.
Chapter 23 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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