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AP Physics 1 Circuits Ch 19

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Section 1

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resistance law

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Date created

Mar 1, 2020

Cards (36)

Section 1

(36 cards)

resistance law

Front

change in potential through a resistor in the direction of current is -iR change in potential through a resistor in the opposite direction of current is iR

Back

voltmeter

Front

measures voltage (Volts)

Back

Kirchhoff's Law

Front

algebraic sum of the changes in potential encountered in a complete traversal of any loop of a circuit must be zero

Back

parallel circuits

Front

current has multiple paths to follow, broken circuit may not stop electrical flow, voltage is same throughout each resistor, current adds for each

Back

direct current

Front

flows 1 direction only, defined by Ohm's law

Back

current

Front

flow of positive charges in theory but flow of negative charges in real life, a river of electrical energy that moves through a wire, must have a closed continuous loop to work, number of charges that travel per second (Amps) I=q/t

Back

voltmeter symbol

Front

Back

ground symbol

Front

Back

resistor (fixed) symbol

Front

Back

resistance

Front

impedes current, uses energy (Ohms Ω)

Back

fuse symbol

Front

Back

P=I²R=V²/R=IV

Front

power equation, P=power(watts)=energy/time, I=current (Amps), R=resistance (Ω), V=voltage (Volts)

Back

switch symbol

Front

Back

battery

Front

voltage (source) (Volts)

Back

resistance in circuits

Front

parallel: 1/R=1/R1+1/R2+1/R3+... (decreases w/additional resistors) series: R=R1+R2+R3+... (increases w/ additional resistors)

Back

current in circuits

Front

parallel: I=I1+I2+I3+... (increases w/ additional resistors) series: I=I1=I2=I3=... (decreases w/ additional resistors, ammeters only)

Back

no electric connection symbol

Front

-|-

Back

ammeter symbol

Front

Back

series circuit

Front

current has only one path to follow, broken circuit stops all flow of electricity, current is the same through each resistor, voltage adds for each

Back

lamp symbol

Front

Back

electricity danger/electrocution

Front

current causes muscles to contract, not voltage that kills, it's the current, can't let go of what's electrocuting you, causes heart to loose rhythm-fibrillation, burns body tissue, prevented by knowledge, ground wires, & GFI's

Back

DC generator symbol

Front

Back

multi loop map

Front

loop: sum of voltage in a loop should equal zero resistance: same direction as current, V is -iR EMF: same direction, V is +E junction: current S entering a junction must equal the current S existing

Back

electricity analogy

Front

electricity is like a lazy electron who doesn't want to go anywhere, when charge is to flow (like a river), the electron doesn't move, but it pushes its neighbor, this process is repeated for the length of the wire

Back

battery symbol

Front

Back

R=ρL/A

Front

resistance vs. resistivity, R=resistance (Ω), ρ=resistivity (Ωm), L=length of wire (m), A=cross sectional area (m²)

Back

V=IR

Front

Ohm's law equation, V=voltage of battery, I=current, R=resistance

Back

electric connection symbol/junction point

Front

Back

EMF rule

Front

moving through an EMF device in the direction of the arrow causes a change in potential of +E moving through an EMF device in the opposite direction of the arrow causes a change in potential of -E

Back

ammeter

Front

measures current (Amps)

Back

schematics

Front

a sketch of what a circuit looks like, represents how the current will flow in the circuit, specific types of symbols for sketches

Back

conductor symbol

Front

Back

capacitor symbol

Front

Back

multi-loop circuits

Front

more than one source in a circuit

Back

voltage in circuits

Front

parallel: V=V1=V2=V3=... (voltmeters only for voltage) series: V=V1+V2+V3+...

Back

Ohm's law

Front

Ohm defined how current (amps), voltage (volts), and resistance (Ohms Ω) relate

Back