DVOM Basics (Digital Volt Ohm Meter)
Summary
TLDRIn this tech video, viewers are introduced to the fundamentals of car electrical systems using a digital volt-ohmmeter. The tutorial covers the three key terms: voltage (pressure), current (amperage), and resistance (ohms). Demonstrations include measuring voltage across a battery and a headlight circuit, testing resistance with a light bulb, and checking current flow in a light circuit. The video aims to make viewers proficient in using a DVOM for diagnosing car electrical issues.
Takeaways
- 🔌 To work on a car, understanding the basics of electricity is crucial, including voltage, current (amperage), and resistance (ohms).
- 💡 Voltage is like water pressure; it's the electro-motive force that a charged battery provides, typically around 12.6 volts in a car.
- 💧 Current, or amperage, represents the flow of electricity doing work, similar to water flowing through a pipe.
- ⚙️ Resistance (ohms) is the opposition to the flow of current, like a water wheel or a light bulb that does work when electricity passes through it.
- 🛠️ A digital volt-ohmmeter (DVOM) is a handy tool for measuring these three electrical properties in a vehicle's electrical system.
- 🔋 To measure voltage, you can connect the DVOM across the battery or within a circuit, such as from the battery to a headlight.
- 🔍 To check resistance, use the ohms setting on the DVOM and connect it across a component, like a light bulb, to measure its resistance value.
- 🔌 When measuring amperage, it's important to shunt the meter to protect it from high currents, which involves opening the circuit and connecting the meter in series.
- 🔦 The DVOM can be used to diagnose electrical issues in a car, such as finding the cause of a malfunctioning fuel pump or headlight.
- 👨🏫 The video emphasizes the importance of hands-on practice with a DVOM to become proficient in automotive electrical troubleshooting.
- 📢 The video also encourages viewers to follow the channel on social media platforms like Twitter and Facebook for more content.
Q & A
What are the three basic terms of electricity discussed in the video?
-The three basic terms of electricity discussed in the video are voltage, current (also known as amperage), and resistance (measured in ohms).
How is voltage compared to water pressure in the video?
-Voltage is compared to water pressure by illustrating that, like water, it is a form of pressure or force. The battery is described as a pressure maker, and the voltage is represented by the pressure in the water jug.
What is the typical voltage of a car battery when fully charged?
-The typical voltage of a car battery when fully charged is about twelve point six volts.
What does the term 'amperage' refer to in the context of the video?
-In the video, 'amperage' refers to the flow of electric current, which is the amount of electric charge passing through a conductor per unit of time.
How is resistance demonstrated in the video using a water wheel analogy?
-Resistance is demonstrated using a water wheel analogy where the water wheel represents a device that does work against the flow of electricity, similar to how a fuel pump or wiper motor would in a car.
What is the purpose of using a digital volt ohmmeter (DVOM) in car repair?
-A digital volt ohmmeter (DVOM) is used in car repair to measure voltage, current, and resistance, which helps diagnose electrical issues and ensures the proper functioning of the vehicle's electrical system.
How does the video explain the process of measuring voltage with a DVOM?
-The video explains that to measure voltage with a DVOM, one can either connect it across the battery terminals or connect it across a specific circuit, such as a headlight, to check the voltage at that point.
What is the significance of measuring ohms of resistance in car electrical systems?
-Measuring ohms of resistance is significant because it helps identify faulty components that may have increased resistance, which can prevent the proper flow of electricity and cause the device not to function.
Why is it important to shunt the meter when measuring amperage in the video?
-It is important to shunt the meter when measuring amperage to protect the meter from potential damage. Shunting redirects some of the current away from the meter to prevent overloading it, especially since the meter is fused.
How does the video demonstrate measuring amperage with a DVOM?
-The video demonstrates measuring amperage by first shunting the meter, then disconnecting the light bulb to open the circuit, and finally connecting the meter across the open circuit to measure the current flowing through the light bulb.
What is the final advice given in the video regarding using a DVOM for car electrical troubleshooting?
-The final advice given in the video is to become proficient with using a DVOM to diagnose and fix electrical issues in cars, and to follow the channel on social media for more information.
Outlines
🔌 Understanding Car Electrical Systems
This paragraph introduces the basics of car electrical systems using the analogy of water pressure to explain voltage. It covers three key terms: voltage, current (amperage), and resistance (ohms). Voltage is likened to pressure, with the car battery acting as a pressure maker. The car's voltage is around 12.6 volts. Current is discussed as the flow of electricity, which does work in the form of resistance. An example is given where a wheel could be a fuel pump or a wiper motor, and resistance is the work done by the current. The paragraph concludes by introducing a digital volt-ohmmeter (DVOM) and explaining how to use it to measure voltage, resistance, and current in a car's electrical system.
Mindmap
Keywords
💡Digital Multimeter
💡Voltage
💡Current (Amperage)
💡Ohms (Resistance)
💡Electro-Motive Force (EMF)
💡AC Voltage
💡DC Voltage
💡Shunt
💡Circuit
💡Electrical Gremlins
Highlights
Introduction to using a digital volt ohmmeter for car repair
Explanation of the three basic terms of electricity: voltage, current, and resistance
Voltage described as pressure, with the car battery as a pressure maker
Demonstration of voltage with a water analogy
Current (amperage) explained as the flow of electricity doing work
Resistance (ohms) described as the opposition to the flow of electricity
Practical demonstration of measuring voltage across a car battery
Explanation of measuring voltage in a car's electrical circuit
Tutorial on how to use the ohms setting on a digital volt ohmmeter
Practical demonstration of measuring resistance with a light bulb
Introduction to measuring amperage (current flow) with the digital volt ohmmeter
Importance of shunting the meter to protect it when measuring amperage
Practical demonstration of measuring amperage in a car's electrical circuit
Advice on using the digital volt ohmmeter to diagnose electrical issues in cars
Encouragement to follow the channel on social media for more content
Transcripts
to work on a car today you're gonna need
one of these a digital vote ohmmeter
you're also gonna have to know the
basics of electricity today on tech
videos we're gonna take you through both
[Music]
three terms I like to talk about voltage
current which is amperage and ohms of
resistance let's start out with voltage
now like water voltage is pressure
electro-motive force our battery is a
pressure maker when you charge it it has
voltage our car has about twelve point
six volts you can see here the more I
put in the more pressure we're gonna
have so consider this water this jug on
this side actual pressure voltage now
over here when I pull the plug it's
gonna run through here that's amperage
or current as electricity starts to run
it's gonna do some work it's gonna do
the work in the form of resistance ohms
of resistance now our wheel here that
could be a fuel pump that may be a wiper
motor but it's actually gonna do some
work so when I pull the plug
we'll see the actual voltage start to go
down the current will slow down
eventually and the work will stop so
there goes our voltage or current
running it's running our fuel pump when
the voltage starts to go away the
current slows down the fuel pumps not
going to work anymore three terms and we
can look at them at the DV om that's
voltage current and resistance all right
let's get that DV om digital volt
ohmmeter in your hand and make you feel
comfortable with it it's pretty simple
right here it starts out with volts now
this first one is AC voltage some wheel
speed sensors maybe some pickups in the
distributor but most of our cars DC volt
so I'm gonna come over to DC volts a
little dotted with the wavy line we can
do two things we can come right across
the battery here with the positive to
the negative and we can look at the
pressure you remember that actual
pressure the water in that container
that's voltage it's got twelve point
three five volts of pressure or we can
go to the circuit itself I can come from
the negative and go right up to the
headlight and you can see there it's
about eleven point six zero right to the
headlight so you can go to a point or
you can go across the circuit next one I
want to look at ohms of resistance
that's the Omega the Horseshoe here now
ohms of resistance that water wheel that
water wheel had a resistance value this
light bulb has a resistance value the
electricity is gonna go in it's gonna
light it up in the form of work and we
can measure that so I can go across one
side of this and I'll go inside and I'll
touch the other side and if I can get a
contact here between
the two sides you can actually see
there's gonna be a ohm value inside of
here there it goes
so the light bulb hat is around two ohms
flicking back I'm wiggling a little bit
but it's gonna change ohms point six
point seven that's the actual element
inside of there that's the ohms of
resistance now last but not least is
amperage amperage is that current flow
when that water was running we were
getting current flow that's gonna light
the lights in the form of work so if I
switch my meter over here two amps now
it's very important to shunt the meter
why am i shunting the meter because it's
fused I want to protect the meter inside
because the amps are gonna run through
the meter in order to run through the
meter that means we're gonna have to
open up the circuit so I'm gonna come up
here to the light bulb light I'm gonna
disconnect it and the light bulb goes
out and then what's gonna happen as I
come through I'll take one connection to
one side and I'll take the other one to
the other and we'll go ahead and
complete the circuit and we can look at
2.3 around 2 amps of electricity it's
taken to run to those light bulbs so
with volts amps and ohms of resistance
you can be pretty proficient with that
DV om and get out work on your car find
out if you have any electrical gremlins
that you want to fix
don't forget follow us on Twitter look
us up on Facebook and social media
thanks for watching
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