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(SPST) - 2 contacts is called Single-pole, Single-throw
(SPDT)- 3 contacts is calledSingle-pole, Double-throw

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Open position-the contacts are not connected so no current will flow through the switch
Closed position-the contacts are connected so current is able to flow through the switch

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Current will flow only in the path of least resistance

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resistance (Ω)

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What is a Variable Resistor?

A resistor restricts current flow in an electrical circuit without switching the current off. A variable resistor allows more control over current flow by changing the amount of resistance. When resistance increases in a variable resistor, the amount of current that is allowed to flow in a circuit decreases. Two basic components make up variable resistors. The resistive material is the first component and is called the element

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variable resistor function - Google Search

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Main power has an alternating current which means that the flow of electricity continually changes direction in a circuit

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Main power has an alternating current which means that the flow of electricity continually changes direction in a circuit

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to test whether the circuit is performing the way you intended it to work

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-SPST (single-pole, double-throw)

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Parallel Circuits
the current can be different from point to point because the current can subdivide at the junctions into multiple paths

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-Measure component values
-Troubleshoot circuits
Measures
-Current (A)
-Voltage (V)
-Resistance
Probes
-Negative ( - )
-Postive ( + )

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connecting switches in series and parallel(Danial)

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connecting switches in series and parallel(Danial)

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When switches connected in series, they must be closed before current will flow.

When switches connected in parallel, the current will flow to any switch when closed

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there are different types of batteries like AAA,AA,C,D,and PP3.

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Series circuit
The current is the same at any point in the circuit because there is only one path

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For mains power, it has an alternating current. Alternating current flow of electricity changes direction continually. For Direct current, it only flows one direction.

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where does each switches commonly found (Arvin)

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where does each switches commonly found (Arvin)

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-Slide switch is commonly used on toy car
-Push to make switch is commonly used on lights switch
-Push to break switch is commonly found on emergency button

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**CURRENT takes the path with LESS resistance**
**Current goes from POSITIVE to NEGATIVE**
Multimeter
Black wire---Negative
Red wire----Positive

Circuit
Series---All switches must be closed
Parallel----Current will flow when some switches are closed

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electronic systems
- Input is for gathering information.
- Process  is deciding what to do with the information.
- Output is involves switching a device on or off.

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MULTIMETER
- BY Toching the probes  on diff point in a circuit , you can take readings of Voltage , current and resistance .

(ammeter)

(voltmeter)

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Types Of Switches
- Single-pole
-Single-throw

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A switch with two contacts is called a single pole , single -throw (SPST) switch. It is either CLOSED and OPEN.

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Switches

Open position- Contacts are not connected so no current will pass through .

Closed circuit- Contacts are connected so current will pass through

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-rocker switch (switch on lamps and electrical kettle,the switch rocks like a see-saw between the ON and the OFF)
-slide switch (switch for toys,electronic games,radio and portable torchlight,they comes in a range of size, millimetres long to several centimetres)

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- For turning lights on or off
-When using telephone buttons
-Turning radios and computer on or off
Open position - the contacts are not connected so no current flow , Closed position - contacts are connected so current is able to flow through the switch
When switch is turn 'OFF' the current is unable to flow so it will not light up
When switch is turn 'ON' the current can flow through

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MULTIMETERS

- It measures component values
- troubleshoot electronic circuit
- measures current,voltage,resistance

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Toggle switch - Has lever that can moved between different positions
Rocker switch - Usually used on lamps and electric kettles.

Slide switch - Commonly used in toys/electronic games/radios and torches.

Micro switch - Act as safety devices to break the circuit when the door or cover is opened.

Reed switch - As the magnet is brought near the switch it can causes the contact to either open or close. Use in alarm system to detect when the door is opened.

Tilt switch - When the switch is upright the ball connects the two connecting leads. when it is tilt the ball moves away from the leads and breaks the circuit.

Push-button switch - Calculators/telephones/TV remote and etc. Some will stay ON(pressed) others will stay ON(once) and will turn OFF(pressed again).

Membrane panel switch - Cash dispenser/photocopies/vending machines and etc.

.

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How to use a multimeter?

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Products Featured in this Video: Digital Multimeter - Basic: https://www.sparkfun.com/products/12966 USB Digital Multimeter - Auto-Ranging (RS232 Output): https://www.sparkfun.com/products/12967 Mooshimeter: https://www.sparkfun.com/products/13843 Multimeter Probes - Needle Tipped: https://www.sparkfun.com/products/12078 Multimeter Probes - Tweezers: https://www.sparkfun.com/products/11060 Digital multimeters are indispensable tools that allow you to analyze circuits and diagnose problems in your electrical design.

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SWITCHES
-Turn lights on or off
-telephone buttons
-turnin

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-meausre component value
-trouble shoot
-measure
-current(v)
-voltage(A)
-resistances

probes
back "-"
red"+

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-Electricity flows around the circuit from the positive to the negative.
-measures
-voltage(V)
- Current(A)
- Resistance(OMEGA)
Batteries are called POLARITY