Conceptual Physics-Electricity Unit- Quiz 2 (Ohm's Law)

Question 1

Voltage

Answer 1

energy used to move electrons (energy per charge); the “push”; can be used to run devices; symbol V

Question 2

Voltage is measured in…

Answer 2

volts; symbol V

Question 3

Current

Answer 3

flow of charges (electrons) through conductors; speed of charges; amount of charges going past a point in one second; symbol I

Question 4

Current is measured in…

Answer 4

Amperes or Amps; symbol A

Question 5

Resistance

Answer 5

opposition of a material to the flow of charges; a resistor is something that slows down current; symbol R

Question 6

Resistance is measured in…

Answer 6

Ohms; symbol Omega:

Ω

Question 7

The relationship between Current and Resistance…

Answer 7

is an inverse relationship- if one goes up, the other goes down, and vice versa. (considering Voltage is constant)

Question 8

The relationship between Current and Voltage…

Answer 8

is a direct relationship- if one goes up, so does the other, and vice versa. (considering Resistance is constant).

Question 9

How is a voltmeter wired into a circuit?

Answer 9

in parallel

Question 10

How is an ammeter wired into a circuit?

Answer 10

in series

Question 11

Ohm’s Law

Answer 11

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

Question 12

What are the differences between Parallel and Series circuits?

Answer 12

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.

Question 13

CirSym:

Conductor or Wire

Answer 13

line

Question 14

CirSym:

Connection

Answer 14

dot on line

Question 15

CirSym:

Bulb

Answer 15

line going up into an “M” shape within a circle

Question 16

CirSym:

One cell or battery

Answer 16

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.

Question 17

CirSym:

Switch

Answer 17

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

Question 18

CirSym:

Resistor

Answer 18

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

Question 19

CirSym:

Ammeter, Voltmeter, Generator

Answer 19

A, V, or G within circle on wire

Question 20

Bonus: What is the equation for parallel resistance?

Answer 20

(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