PHYS 222 Worksheet 12-Kirchhoff's Laws Supplemental Instruction lowa State University Useful Equations ΣΙ=0 ΣV=0 Junctio

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PHYS 222 Worksheet 12-Kirchhoff's Laws Supplemental Instruction lowa State University Useful Equations ΣΙ=0 ΣV=0 Junction Rule. The algebraic sum of the currents into any junction is zero Loop Rule. The algebraic sum of the potential difference in any loop must equal zero. Diagrams Junction Loop R 12 Loop 2 Loop 3 w 81 E2 R2 14 R4 Junction Nota junction Nota junction +8: Travel direction from-to + -8: Travel direction from + to +IR: Travel opposite to current direction: -IR: Travel in current direction: Travel Travel Travel 14 wt Travel 14 wt R Related Problems 28.0 V R 1) Find the following for the circuit (Book 26.21) (a) Current in resistor R (b) Resistance R (c) Unknown EMF (d) If the circuit is broken at point x, what is the current in resistor R? 4,00 A w 6.00 12 6.00 A W 3.00 12 30.02 w 20.0 12 T 25.0 V E-? Both meters are ideal. Voltmeter reads 16.0 V when switch is open. Find the EMF. What will the ammeter read when the switch is closed? (Book 26.27) 75.03 12 50.0 12