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DC-Circuits

# DC-Circuits - PHY124 DC CIRCUITS Exp 3 Abstract In this lab...

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PHY124 DC CIRCUITS Exp. 3 Abstract In this lab we will have several objectives: 1. Understand the properties and use of a “Voltmeter”. 2. Understand the properties and use of an “Ammeter”. 3. Measure (and alter) several DC circuits to verify and understand Ohm’s Law. 4. Verify the properties of resistors in series and parallel. 5. Understand and calculate the power dissipated by a resistor. 6. Demonstrate that not all circuit elements behave like a resistor ( i.e. V negationslash = IR ). 1 Knowledge, Understanding, and Skills You should have a “hands-on” experience and ability with all the following: The correct way to incorporate a voltmeter into a circuit (and why this is so). The correct way to incorporate an ammeter into a circuit (and why this is so). Why a voltmeter ideally has a very large internal resistance. Why an ammeter ideally has a very small internal resistance. How to determine resistance from a single measurement as well as from a graph. How to calculate equivalent resistance for series and parallel configurations. How to measure power dissipated by a resistor. 2 Equipment 1 DC Power Supply 1 Voltmeter 1 Ammeter 1 board with resistive and non-resistive components 7 wires 4 clamps

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PHY124 DC CIRCUITS Exp. 3 Figure 1: Here is the equipment of the lab.
PHY124 DC CIRCUITS Exp. 3 3 Principles of Volt and Ammeters A voltmeter is a meter used to measure the potential difference (Δ V ) between two points on a circuit. This meter is always connected in parallel with device being measured (battery, resistor, capacitor, etc.) since all devices wired in parallel have the same voltage as one another. Ideally, the voltmeter will have an infinite resistance. This is because after “infinity” is placed in parallel with a finite resistance R, the resulting total resistance remains R (you should be able to prove this statement). In this way the addition of the voltmeter in parallel to any point in a circuit, allows the circuit

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DC-Circuits - PHY124 DC CIRCUITS Exp 3 Abstract In this lab...

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