سؤال وجواب في الكهربية Electricity
Question 1 Question: What is the SI unit of charge Answer: The SI unit of charge is coulomb. Question 2 Question: How many electrons constitute a charge equal to 1 C Answer: 1 Coulomb of charge has 6.25 x 10^18 electrons. Question 3 Question: State ohm's law. Answer: When temperature and other physical parameters remain constant, the current flowing through a conductor is directly proportional to the potential difference across its ends. Question 4 Question: Which effect of current is used in the following appliance? a) electric bulb b) immersion rod c) electric iron d) galvanometer Answer: For electric bulb, immersion rod and electric iron, heating effect of current is used. For galvanometer magnetic effect of current is used. Question 5 Question: Define watt and watt hour. Answer: Watt is the unit of power. If 1 joule of energy is consumed in 1 second, we say the power of the device is 1 watt. Watt hour is the unit of energy. If a device with a power 1 watt works for 1 hour 1 watt hour amount of energy is consumed. Question 6 Question: Which of the following graphs depict ohm's law. Answer: [عزيزى الزائر لايمكنك مشاهده الروابط الا بعد التسجيلللتسجيل اضغط هنا] Graph (a) represents ohm's law since a straight line which shows that 'I' is directly proportional to 'V' (i.e., ohm's law). Question 7 Question: On what factor's does the heating effect of current depend on. Answer: The heating effect of current depends on The square of the amount of current flowing The resistance of the wire and The time of flow of current Question 8 Question: Name the instrument that measures the potential difference across the ends of a current carrying conductor. How is the instrument connected to the circuit? Answer: Voltmeter measures the potential difference across the ends of a conductor. It is connected in parallel across the element through which current flows due to a certain potential difference. Question 9 Question: When are several resistors in a circuit said to be connected in parallel? Answer: Several resistors are said to be connected in parallel when the potential difference across the resistors remain the same. |
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