PhET Faraday's Law Simulation - PDOM Sketch

Owned by Jonathan Hung
Last updated: Jul 03, 2018
4 min read

Moved

The content of this document is now merged with PhET Faraday's Law Simulation - Text descriptions, alerts, and keyboard access.

This page is no longer being updated and will be deleted.

Alerts

Movement Alerts

Magnet Focus Alert (First time focusing)

  • "Magnet at [location] of the Play Area. Use the W A S D keys to move the magnet. Number 1, 2, or 3 keys to slide the magnet."

Magnet Focus Alert (after first time focusing)

  • "Magnet at [location] of the Play Area."

Initial step made after: focusing; step direction change; or step size change

  • "A [step size] step  [step direction]."
  • Note: there is no alert for steps made after an initial step. Subsequent steps will have a magnet move sonification mapped to velocity.

Slide start alert: on release of 1, 2, or 3 key press

  • "Sliding magnet [slide speed] to [slide direction] side of play area. Press Space to stop slide."

Slide stop alert: Space bar is pressed, bumped into a coil or reached edge of play area

  • "Sliding stopped."

Sliding in progress

  • Note: there is no alert for sliding in progress as there will be a magnet move sonification mapped to velocity.

Coil bump alert

  • "Bumped into [number coils] coil."

Location Alerts

Location change alert: magnet transitions from one location region into another

  • "At [location] of play area."

Coil proximity change alert: magnet transitions from one coil proximity region into another

  • Single coil: "[coil proximity] 4-loop coil."
  • Both coils: "[coil proximity] 4-loop coil. [coil proximity] 2-loop coil."
  • (info) Alert Frequency: This alert is omitted if the user's action will trigger an Entrance Direction or Exiting Coil alert.

Coil proximity change event with magnetic field enabled

  • Single coil: "[coil proximity] 4-loop coil and [field strength] magnetic field passing through."
  • Both coils: "[coil proximity] 4-loop coil and [field strength] magnetic field passing through. [coil proximity] 2-loop coil and [field strength] magnetic field passing through."
  • (info) Alert Frequency: This alert is omitted if the user's action will trigger an Entrance Direction or Exiting Coil alert.

Coil Entrance Direction Alert

  • "[number coils] coil entrance to the [left / right]."
  • "[number coils] coil entrance no longer to the [left / right]."
  • (info) Alert Frequency: this alert should occur only once and during the transition into the region.

Exiting Coil Alert

  • "Exiting [number coils] coil."

Sim Controls Alerts

Volt meter: adding / removing

  • Adding Volt Meter: "Connecting volt meter to circuit"
  • Removing Volt meteter: "Removing volt meter from circuit"

Magnetic field: show / hide

  • Showing field lines single coil: "Showing magnetic field lines. [field strength] magnetic field passing through 4 loop coil."
  • Showing field lines both coils with DIFFERENT intensities: "Showing magnetic field lines. [field strength] magnetic field passing through 4 loop coil. [field strength] magnetic field passing through 2 loop coil."
  • Showing field lines both coils with SAME intensities: "Showing magnetic field lines. [field strength] magnetic field passing through both 4 loop and 2 loop coils."
  • Hiding field lines: "Hiding magnetic field lines.

2 loop coil: show / hide

  • Adding 2-loop coil: "Adding 2 loop coil to circuit."
  • Removing 2 loop coil: "Removing 2 loop coil from circuit."

Rotate magnet

  • "Flipping magnet: North pole is now on ['left' / 'right']. South pole now on ['right' / 'left']."

Rotate magnet: with visible field lines

  • "Flipping magnet and its magnetic field: North pole is now on ['left' / 'right']. South pole now on ['right' / 'left']."
  • Remark: This is the same description as a regular "Rotate Magnet" alert text with the addition of "and its magnetic field".


Alert Descriptor Values

coil proximity:

  • Far from
  • Close to
  • Very close to
  • In

field strength:

  • Very strong
  • Strong
  • Weak
  • Very weak
  • Minimal

slide direction:

  • left
  • right

slide speed:

  • slowly (1 key pressed)
  • normally (2 key pressed)
  • quickly (3 key pressed)

location:

  • top-left
  • top-center
  • top-right
  • middle-left
  • middle-right
  • center
  • bottom-left
  • bottom-center
  • bottom-right
  • +edge if at edge

number coils:

  • 2 loop
  • 4 loop

step direction:

  • left
  • right
  • up
  • down

step size:

  • regular (default)
  • large (if CTRL modifier pressed)
  • small (if Shift modifier pressed)


Faraday's Law (h1)

Scene Summary (h2)

Faraday's Law is an interactive sim. It changes as you play with it.

The play area has a light bulb circuit, and a moveable bar magnet. There are controls that change what is connected to the circuit,  flip the bar magnet, and reset the sim.

Move the magnet to play.

Play Area (h2)

Light Bulb Circuit (h3)

(If just 4 loop coil attached)

In circuit are a light bulb and 4 loop coil. The coil is open on the left and right - the bar magnet can pass through.

(If 2 loop or volt meter attached)
In circuit are a:

  • 4 loop coil
  • 2 loop coil (if enabled)
  • Volt meter (if enabled)

The coils are open on the left and right - the bar magnet to pass through.

(Static)

Controls:

  • Checkbox: Connect volt meter to circuit
  • Checkbox: Show field
  • Checkbox: Add 2 loop coil to circuit

Magnet (h3)

(If just 4 loop coil attached)

The bar magnet is at the [ location ] of the Play Area.

(If 2 loop coil attached)

The bar magnet is:

  • [ location ] of the Play Area
  • [proximity] to the 4 loop coil.
  • [proximity] to the 2 loop coil.

Magnet polarity:

  • North on the [left / right]
  • South on the [right / left].

Button: flip magnet (Help text: "Flip North and South poles")

(If field lines visible) Field Lines (h3)

Magnetic field lines go around from North end on [right / left] side of magnet, to South end on [left / right] side of magnet.

(If just 4 loop coil attached)

From the magnet's position, a[field strength] magnetic field is passing through the 4 loop coil.

(If 2 loop coil attached)

The magnet field strength is:

  • [field strength] at the 4 loop coil.
  • [field strength] at the 2 loop coil.