* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download DC Circuit Analysis
Crystal radio wikipedia , lookup
Lumped element model wikipedia , lookup
Power electronics wikipedia , lookup
Negative resistance wikipedia , lookup
Flexible electronics wikipedia , lookup
Index of electronics articles wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Schmitt trigger wikipedia , lookup
Valve RF amplifier wikipedia , lookup
Power MOSFET wikipedia , lookup
Integrated circuit wikipedia , lookup
Operational amplifier wikipedia , lookup
Electrical ballast wikipedia , lookup
Regenerative circuit wikipedia , lookup
Opto-isolator wikipedia , lookup
Surge protector wikipedia , lookup
Surface-mount technology wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Two-port network wikipedia , lookup
Current source wikipedia , lookup
Rectiverter wikipedia , lookup
Current mirror wikipedia , lookup
DC Circuit Analysis Overview DC Circuit Analysis DC Circuits are analyzed in 3 models Circuit Analysis investigates: • Series resistors • Parallel resistors • Combination resistors • Equivalent resistance • Circuit current in/out battery • Voltage drop across components • Current through components What is a circuit? A circuit comprises: • Voltage source (ex. battery) • Load (ex. Resistors) • Conductor (ex. Wires) • Control (ex. Switch) Circuit Symbols Resistor Voltage source (battery) Switch Wire (Conductor) DC Circuit Analysis - Series Resistors are connected “nose-tail” or inline There is only one path for the circuit current (I) to flow. DC Circuit Analysis – Series Equivalent (or total) resistance Current is the same through all components = circuit current (I) Voltage drop across each resistor (n) • R T = R 1 + R2 + R3 • Vn = I*Rn • Sum of voltage drops = battery voltage DC Circuit Analysis – Series Practice Analyze the series circuit by calculating: • • • Equivalent resistance RT Circuit current (I) flowing into/out of the battery Voltage drop across the 3, 4 and 5 ohm resistor DC Circuit Analysis - Parallel Resistors are connected “side by side” There are multiple paths for the current to flow, splitting into branch currents through R1, R2 and R3, according to their resistive values. The circuit current (I) flows into/out of the battery. DC Circuit Analysis – Parallel Equivalent resistance Voltage is the same across all n resistors (V) Current in each resistor (In) • 1/RT = 1/R1 + 1/R2 + 1/R3 • In = V/Rn DC Circuit Analysis – Parallel Practice Analyze a parallel circuit by finding: • • • Equivalent resistance (RT) Circuit current (I) Current (In) through each of the resistors Rn DC Circuit Analysis – Combo Resistors are connected in both series and parallel methods Analyze by starting to simplify from the insideout: • • Simplify R1 and R2 > R12 Add result (R12) to R3 for total circuit resistance (Rtot) Calculate circuit current • I = V/Rtot Calculate currents through selected resistances DC Circuit Analysis – Combo Practice Given V = 12V, R1, R2 and R3 = 1, 2, 3 ohm respectively, calculate: • Equiv resistance (RT) • Circuit current (I) • Current through R2 (I2) • See next slide Combo Shortcut for current R1 and R2 are in parallel, so the voltage drop across each resistor is the same. Shortcut for calculating In when there are 2 resistors (Rlow and Rhigh) in parallel: • Ilow = (Rhigh/(Rlow + Rhigh) * circuit current (I) • Ihigh = (Rlow/(Rlow + Rhigh) * circuit current (I) We are simply apportioning the current according to the resistance • Higher resistance = lower current (and v.v)