Ohms, Power and Kirchhoff's Law

Match the following

• a point where several wires electrically connect

• KVL

• The algebraic sum of all voltages in a loop must equal zero

• Node

• lines with devices connecting two nodes

• Ohm's Law

• Formula used to calculate the relationship between voltage, current and resistance in a circuit

• KCL

• the algebraic sum of all currents entering and exiting a node must equal zero

• Branches

What is the KCL equation for Node A?

• I₁ - I₂ - I₃ = 0

• -I₁ - I₂ - I₃ = 0

• I₁ + I₂ + I₃ = 0

• I₁ + I₂ - I₃ = 0

What is the KVL Equation for Loop 1

• -Vs + V₁ + ₂ = 0

• -V₂ + V₃ + V₄ = 0

• Vs + V₁ - ₂ = 0

• V₂ - V₃ - V₄ = 0

What is the KVL Equation for Loop 2

• -Vs + V₁ + ₂ = 0

• -V₂ + V₃ + V₄ = 0

• Vs + V₁ - ₂ = 0

• V₂ - V₃ - V₄ = 0

Calculate V4 given the following:

Vs = 15V, V1 = 3.5V, V3 = 5V

Calculate R4 given the following:

Vs = 9V, V₁ = 2V, V₃ = 4V, I₄ = 3mA

Type answer in SI Notation

Find the resistance of a circuit that draws 25m amperes with 15 volts applied. Type your answer in Standard notation

• R = 600Ω

• R = 6mΩ

• R = 6000Ω

• R = 1.66 Ω

Calculate the power rating of a home appliance that uses 5 amps of current when plugged into a 220-volt outlet. Type answer in SI notation

A light bulb has a resistance of 6k Ω and a maximum

current of 3m A. How much voltage can be applied

before the bulb will break?

A 12 V car battery pushes charge through the

headlight circuit resistance of 1.5k Ω. How much

current is passing through the circuit? Type your answer in SI notation