* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Ohms - HCC Learning Web
Immunity-aware programming wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Integrating ADC wikipedia , lookup
Josephson voltage standard wikipedia , lookup
Negative resistance wikipedia , lookup
Operational amplifier wikipedia , lookup
Power electronics wikipedia , lookup
Two-port network wikipedia , lookup
Schmitt trigger wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Voltage regulator wikipedia , lookup
Opto-isolator wikipedia , lookup
Power MOSFET wikipedia , lookup
Surge protector wikipedia , lookup
Electrical ballast wikipedia , lookup
Current source wikipedia , lookup
Rectiverter wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Network analysis (electrical circuits) wikipedia , lookup
OHM’S LAW OBJECTIVE The purpose of this experiment is to verify the linear relationship between current and voltage across resistors in series and parallel connections. APPARATUS DC Voltage Supply Digital Multimeter Electric wires Set of resistors EXPERIMENTAL PROCEDURE I RESISTORS IN SERIES a) b) c) d) Connect the two resistors in SERIES with the voltage source. Start incrementing the voltage by 2 volts until you reach 12 volts. For each voltage, measure the current in the circuit with the ammeter. Graph the voltage versus current. From the slope, calculate the total resistance of the circuit. Find the percent error in the measurements of the total resistance. Voltage 2 4 6 8 10 12 True Calculated Resistance Resistance Error Current Resistance II RESISTORS IN PARALLEL a) b) c) d) Connect the two resistors in PARALLEL with the voltage source. Start incrementing the voltage by 2 volts until you reach 12 volts. For each voltage, measure the current in the circuit with the ammeter. Graph the voltage versus current. From the slope, calculate the total resistance of the circuit. Find the percent error in the measurements of the total resistance. Voltage 2 4 6 8 10 Current Resistance 1 12 True Calculated Resistance Resistance Error QUESTIONS 1) Convert the unit of OHM into its combination of the fundamental SI units. 2) Two resistors of 20 Ω and 40 Ω are connected in parallel. What resistance must be connected in parallel with them to make the total resistance equal to 12 Ω ? 3) A lamp is connected to a 90-V line. The current in the filament starts at 10 A and drops quickly to 2 A . Why does this happen? By what factor does the resistance increase? 4) A 4.0-Ω resistor, an 8.0-Ω resistor, and a 12-Ω resistor are connected in series with a 24-V battery. a) What is the current in each resistor? b) Repeat for the case in which all three resistors are connected in parallel across the battery. 2