NEW DIGAMBER PUBLIC SCHOOL Session :- 2012-13 subject :- Factors affecting internal resistance of a cell Made by :- Saurabh godha (xii - B) submitted to :- Mr. Harshad shevgaonkar Certificate NAME : Saurabh Godha CLASS : XII - B ROLL NO. : 19 INSTITUTION : New Digamber Public School This is certified to be the bonafide work of the student in the PHYSICS INVESTIGATORY PROJECT during the year 2012 / 2013 . ............................
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accurate graph. Analysis When the bulbs received more current the molecules in the bulb vibrated fast and the bulb became warmer as the resistance increased. As the voltage increased the current and resistance did also. The resistance of the 6V bulb increased as the current and voltage did. However‚ in the pure resistor trial experiment the resistance stayed around the same as the current and voltage increased. The difference between the bulbs and trial experiment graphs are that
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null principle. They give very high degree of accuracy. Bridges Instruments are used to measure • Resistance‚ Inductance‚ Capacitance • Purity of components • Impedances and admittances • Physical parameters Bridge Instruments Types of Bridges • • AC Bridge DC Bridge DC Current Bridge Instruments • Wheatstone bridge and Kelvin Bridge • Used for measurement of resistance • Made sensitive to temperature‚ pressure and light • Complex physical phenomena such as dew point
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investigate how the resistance of the wire affects a current flowing through a wire. I know that as resistance changes‚ current changes‚ as Ohm’s law: I = V/R. If one part of an equation changes‚ the equal must be done to the opposite side. To detect how resistance affects current‚ I must first discover what factors affect resistance. These factors are: · Length of the wire if a wire is longer; there are more particles for electrons to move through‚ and therefore more resistance. · Conductivity
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Science practical report (The relationship between voltage and Current) Aim: To find out how current‚ voltage and résistance in a electric circuit are related. Hypothesis The reading for both voltmeter and ammeter will have complete different results in relationship to the resistor‚ voltage and current. That voltmeter will have a higher reading than ammeter. Materials * Power pack * Piece of nidrome * 50 cm long or a resistor * Hear proof mat * 6 connecting wires *
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series circuit only has one path for current to flow. 3) The sum of all the voltages sources is equal to the sum of all the voltage drops. 4) The total resistance in the circuit is equal to the sum of the individual resistances. 3. Calculate the total resistance in the circuit below. Show the formula used. Calculated: = __6.5kΩ____ (Total resistance) Rt = R1+R2+R3 = 1kΩ + 3.3kΩ + 2.2kΩ = 6500 x 10^3= 6.5kΩ 4. Download the Multisim file “Series1” from Doc Sharing‚ Week 3. Run the simulation and
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more light hitting the LDR and so its resistance decreases and the light turns off. When it is night there is less light so the LDR has higher resistance and the light turns on. Explanation: When light shines on a Light Dependent Resistor‚ electrons are released and the current can get larger. So as the light intensity increases‚ more electrons are released and the resistance decreases. As the light intensity decreases‚ less electrons are released and the resistance increases. 2. Think about the research
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Measured in Amps‚ A 1/1000th of an Amp is a milliamp – mA Power is Voltage x Current Measured in Watts‚ W 1/1000th of a Watt is a milliwatt mW Media Theory & Practice BASIC ELECTRONICS RESISTANCE Almost everything that conducts electricity has a resistance. It doesn’t conduct it perfectly. Resistance is measured in Ohms (Ω) 1000Ω = 1kΩ 1‚000‚000Ω = 1MΩ Media Theory & Practice BASIC ELECTRONICS OHMS LAW Relates Voltage and Current in a simple
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nanofilm piezoresistors‚ deposited on the oxidized micromachining silicon diaphragm‚ are connected into Wheatstone bridge configuration. For constant voltage VB supply‚ the bridge output V0 is: equation(1) where Ri (i = 1–4) is the resistance of bridge resistors. Thermal drift for offset In Eq. (1)‚ the offset disappears if R1R3 is equal to R2R4. Nonetheless‚ R1R3 is not generally equal to R2R4. The pressure sensor‚ thus‚ has an offset: equation(2) V0=S0K0VB Turn MathJaxon
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2. 3. 4. 5. 6. 7. 8. Write the chemical formula for the following: (a) Calcium Fluoride (b) Iron (II) Bromide Name to kinds of cells (elements) of xylem. Two wires‚ one of manganin and the other of copper have equal lengths and resistances. Which one of these wires will be thicker? What does ‘slaking of lime’ stand for? Why is there a hissing sound during this process? Write the chemical equation for the reaction involved. What is autonomic nervous system? What is the function
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