Determine the resistance the resistor
| 14 |
|
10 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Current I � | 10 |
|
or | 10 | |||||||
| � | 10 | � | 10�3 | ||||||||
| 10 | 3 | 1000 | |||||||||
| � | 0 01 | A | |||||||||
V�IR� (0.01) (2000) �20V
Example 1.13
A coil has a current of 50 mA fl owing through it when the applied voltage is 12 V. What is the resistance of the coil?
| � | � | 12 | � | 10 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| I | 50 | � | 10�3 | 50 |
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| � | 12 000 | � | ||||||||||
| 50 | ||||||||||||
| � |
|
� | 100 | � | 10 |
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||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| I | 5 | � | 10�3 | 5 | � | |||||||||
| � | 20 | � | 10 | 3 | ||||||||||
| I | � | � | 25 | � | 10�� |
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|---|---|---|---|---|---|---|---|---|---|---|---|
| R | 20 | � | 10 | 3 | 20 | ||||||
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| An Introduction to Electric Circuits |
|
|---|
| (a) Resistance R | � | 50 | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| � |
|
2400 | Ω | or | 2.4 k |
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| � | 120 | � | 12 000 | � | |||||||||||||||||
| 0 05 | 5 | ||||||||||||||||||||
| (b) Resistance R � | 120 | � | |||||||||||||||||||
| 200 | � | 10�6 | 0 0002 | ||||||||||||||||||
| � | 1200 000 | � | 600 000 | Ω | |||||||||||||||||
| 2 | |||||||||||||||||||||
| or | 0.6 M Ω | ||||||||||||||||||||
| R |
|
� | 20 | A | � | 20 | � | 2000 | � | 1000 | Ω or 1 k |
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|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| I | 20 | mA | 0 02 | 2 | |||||||||
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