Conceptual Physics-Electricity Unit- Quiz 2 (Ohm's Law) Flashcards
Voltage
energy used to move electrons (energy per charge); the “push”; can be used to run devices; symbol V
Voltage is measured in…
volts; symbol V
Current
flow of charges (electrons) through conductors; speed of charges; amount of charges going past a point in one second; symbol I
Current is measured in…
Amperes or Amps; symbol A
Resistance
opposition of a material to the flow of charges; a resistor is something that slows down current; symbol R
Resistance is measured in…
Ohms; symbol Omega:
Ω
The relationship between Current and Resistance…
is an inverse relationship- if one goes up, the other goes down, and vice versa. (considering Voltage is constant)
The relationship between Current and Voltage…
is a direct relationship- if one goes up, so does the other, and vice versa. (considering Resistance is constant).
How is a voltmeter wired into a circuit?
in parallel
How is an ammeter wired into a circuit?
in series
Ohm’s Law
describes the relationship among voltage, current, and resistance;
Mainly V=IR or Voltage is equal to Current times Resistance
Also: I=V/R and R=V/I
What are the differences between Parallel and Series circuits?
In series, Resistances add; In parallel, Resistances are multiplied and then divided by their sum
In Series, voltage adds; in parallel, Voltage doesn’t ?
In series, there is only one path; In parallel, there are multiple paths
In series, adding devices slows the current (if the voltage is constant), and they dim consecutively; In parallel, the current remains constant in all the bulbs.
CirSym:
Conductor or Wire
line
CirSym:
Connection
dot on line
CirSym:
Bulb
line going up into an “M” shape within a circle
CirSym:
One cell or battery
line ending in a short perpendicular dash, then a gap, then a longer perpendicular dash, then the line continues. For multiple batteries, add short and long dashes with gaps then continue line.
CirSym:
Switch
Open: line with a connection on the end, then a tilted line only connected to the other side (with a connection)
Closed: line with two consecutive connections
CirSym:
Resistor
3 Zig Zags: above line, below, all the way above, all the way below, all the way above, then back down to original level of wire and continue line
CirSym:
Ammeter, Voltmeter, Generator
A, V, or G within circle on wire
Bonus: What is the equation for parallel resistance?
(R1xR2xR3...)/(R1+R2+R3...) If all resistors the same, do R to the power of one less than the amount of resistors, divided by amount of resistors: RxRxRxR... 4 x R R's cancel
