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Factors That Influence Resistance

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what is the difference between the heat generated and power dissipated in a resistor What are thier formulas

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Q. Resistors P, Q, and R in the circuit have equal resistances. If the battery is supplying a total power of 12 W, what is the power dissipated as heat in resistor R?

Q. When resistors

R_{1} a n d R_{2}

are connected in series across a battery of potential difference V, the power dissipated by the resistors are

P_{1} a n d P_{2}

respectively. When they are connected in parallel across a battery of potential difference E, the power dissipated is

P_{3} a n d P_{4}

respectively. Which one of the following is true?

Q. Three identical resistors are connected in series. When a certain potential difference is applied across the combination, the total power dissipated is 27 W. How many times the power would be dissipated if the three resistors were connected in parallel across the same potential difference?

Q. A single resistor is connected in circuit. A

2 A

of current is flowing through circuit and potential difference across resistor is

12 V o l t s

. The power dissipated in the resistor is :

Q. (a) What is meant by heating effect of electric current ? Give two applications of heating effect of current.
(b) State the law relating heat dissipated in an electric circuit with the current, potential difference and time.
(c) 50 J of heat is produced each second in a

2 Ω

resistor. Find the potential difference across the resistor.

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