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# Lab Manuals for Circuits and Devices - CD By ANNA SUPERKINGS

• Circuits and Devices - CD
• Practical
• Anna university - ACEW
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#### Lab Manuals for Circuits and Devices - CD By ANNA SUPERKINGS

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MAXIMUM POWER TRANSFER THEOREM EX. NO: 4(a) AIM: To verify the maximum power transfer theorem for the given circuit. APPARATUS REQUIRED: S.NO APPARATUS TYPE RANGE QUANTITY DC (0-30)V 1 - 1KΩ 2 1KΩ 1 DC (0-10)mA 1 1 RPS 2 Resistor 3 Variable Resistor 4 Ammeter 5 Bread board - - 1 6 Connecting wires - - Few THEORY: MAXIMUM POWER TRANSFER THEOREM: In electrical engineering, the maximum power (transfer) theorem states that, to obtain maximum external power from a source to a load with a finite internal resistance, the resistance of the load must be made the same as that of the source. The theorem applies to maximum power, and not maximum efficiency. If the resistance of the load is made larger than the resistance of the source, then efficiency is higher, since most of the power is generated in the load, but the overall power is lower since the total circuit resistance goes up. If the internal impedance is made larger than the load then most of the power ends up being dissipated in the source, and although the total power dissipated is higher, due to a lower circuit resistance, it turns out that the amount dissipated in the load is reduced. WWW.VIDYARTHIPLUS.COM V+ TEAM

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Circuit Diagram for Maximum Power Transfer Theorem CALCULATION: To Find RTH: = 1K = 1K ; To Find VTH: WWW.VIDYARTHIPLUS.COM V+ TEAM

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Let V = 5V, PROCEDURE: 1. The circuit connections are given as per the circuit diagram. 2. Switch ON the power supply. 3. Initially set 5V as input voltage from RPS. 4. The ammeter reading is noted for various values of load resistance and the values are tabulated. 5. The load resistance for the maximum power is obtained from the table. Table: Let V = 5V S.No Resistance(RL) Current(IL) Power (IL2RL) in Ohms 1 100 2 200 3 300 4 400 5 500 6 700 7 900 in mA in mW RESULT: Thus the maximum power transfer theorem for the given circuit is verified successfully. WWW.VIDYARTHIPLUS.COM V+ TEAM

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RECIPROCITY THEOREM EX. NO: 4(b) AIM: To verify the reciprocity theorem for the given circuit. APPARATUS REQUIRED: S.NO APPARATUS 1 RPS 2 TYPE RANGE QUANTITY DC (0-30)V 1 Resistor - 1KΩ 4 3 Ammeter DC (0-5)mA 1 4 Bread board - - 1 5 Connecting wires - - Few THEORY: RECIPROCITY THEOREM: The reciprocity theorem states that if an emf ‘E’ in one branch of a reciprocal network produces a current I in another, then if the emf ‘E’ is moved from the first to the second branch, it will cause the same current in the first branch, where the emf has been replaced by a short circuit. We shall see that any network composed of linear, bilateral elements (such as R, L and C) is reciprocal. Before interchanging: Circuit Diagram for Reciprocity Theorem WWW.VIDYARTHIPLUS.COM V+ TEAM