PPT-8.3 – Resistance and Ohms Law

Section 83 Resistance and Ohms Law Resistance is the property of any material that slows down the flow of electrons ie a load and converts electrical energy into other forms of energy ie light or heat. In contrast a resistor is a component that purposefully impedes or opposes the 64258ow of electrons As an externlly applied electric 64257eld is applied to force current through a resistor the electrons diffuse through the resistive material like a The relationship and the unit of electrical resistance were both named for him to commemorate this contribution to physics One statement of Ohms law is that the current through a resistor is proportional to the voltage across the resistor In this ex 5 volt battery as shown Calculate the current that will flow Solution 1 e are asked for the current 1 2 e know I and 3 Use the formula I 1 6lug in numbers 1 15 I 2 75 9 9nswer 75 amps will flow in the circuit Example 9 light bulb requires 3 amp Given the relationship between these three elements once you know any two of them it is possible to calculate the third Watts Law is similarly useful in figuring out the relationship between power voltage and current Electrical properties Electrom Current/Voltage Measurement. Resistance . Measurement. Wheatone. Circuit. Current/Voltage Measurement. Circuit Model for ideal ammeter/voltmeter. An ideal ammeter has an equivalent resistance of . 0. D. Hunt. Southern Wells Jr-Sr High School. dhunt@swell.k12.in.us. Potentiometer. Variable resistor, or voltage divider. Potentiometer Continuity Testing. Required Materials. Multimeter. Potentiometer. For temperatures -200 D. Hunt. Southern Wells Jr-Sr High School. dhunt@swell.k12.in.us. Potentiometer. Variable resistor, or voltage divider. Potentiometer Continuity Testing. Required Materials. Multimeter. Potentiometer. Resistors in Series. PHET simulation. Resistors in Series. Total resistance for a circuit in series (. Rtotal. ). . Rtotal. = R1 + R2 + R3 + …. Ohm’s Law (V = I x R) . The R typically means total Resistance (. Background and concepts. 2. Microhams 2010 Technician. Radio and Electronic Fundamentals. 3. Ohm’s Law and Power Calculations. E. I. R. P. I. E. E=Voltage (Volts). I=Current (Amps). R=Resistance (Ohms). . 2017. Using conductors made of children’s play (modelling) dough, investigate quantitatively the effect on . resistance, calculated from measurements of voltage across and current through the conductors, of . . 2017. Using conductors made of children’s play (modelling) dough, investigate quantitatively the effect on . resistance, calculated from measurements of voltage across and current through the conductors, of . Electric Current Mr. Charge’s Journey Problem #1 The amount of charge that passes through the filament of a certain light bulb in 2 seconds is 1.67 C. A) What is the current in the light bulb? B) What is the number of electrons that pass through the filament in one second? Electrons flow due to potential difference. If the potential difference is removed, then electrons stop flowing.. As electrons move, they bump into other atoms, this slows them down and impedes their motion..