On a 4 band resistor, the third band represents (a) a digit (b) number of zeros

Question

On a 4 band resistor, the third band represents (a) a digit (b) number of zeros (c) tolerance (d) power limit Why is copper a good conductor of electricity? (a) It is shiny. (b) An electrically neutral copper atom has an outer electron shell completely filled. (c) An electrically neutral copper atom has only one electron in its outer electron shell. (d) It is a soft, flexible metal. Estimate how long can a 1.5V flashlight battery provide a current of 250 mA to light the bulb if the ampere-hour rating is 8 Ah? Show a calculation to justify your answer. (a) 64 hours (b) 24 hours (c) 4 hours (d) 16 hours (e) 32 hours

Explanation / Answer

8) The third digit represents the power of 10 multiplied by the 1st two digits. Hence the 3rd digit gives us the number of zeros . For example: If the digits are 4 7 2 5. The resistance value is 4700 ohms with tolerance 5% Opton(b) is the right answer.

9) Copper has only one electron in its outermost shell. Hence it is easily ionisable. Therefore it is a good conductor electricity. Option(c) is the right answer.

10) Ampere hour rating is the product of current times time. Hence if 250mA is the current and the rating is 8Ah then the time is 8 Ah/250mA=32 hours.

Option (e) is the right answer.

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