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As applied to household AC conventions, there should be no voltage from N to Ground. Neutral is white, hot is black, ground is green. There should be voltage from black to N, Black to G, but not N to G.
Outlets are properly placed with the ground pin down, which puts N, to the left, and Hot to the right. Neutral is the wider one.
As applied to general electronics, the question needs a reference. There is AC, which takes two wires, and a Ground, which may be common to one lead of the AC, or separate, or exist at the center tap of a transformer, making each AC lead half the rms voltage of the lead to lead voltage.
With your multimeter set on voltage, stick one of the probes in the short slot and the other end in the ground opening. The meter should show 120volts. If not, stick one of the probes in the long slot and the other probe in the ground opening. If the meter shows 120 volts, then the polarity is wrong.
Another option would be to have the meter set on resistance. Stick one probe in the long slot and the other probe in the ground opening. There should be no resistance (the circuit will be closed). If the circuit shows open, relocate the probe from the long slot to the short slot. If the circuit shows closed, the the polarity is wrong. This assumes though, that the outlet actually has a ground wire hooked up to it.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoREAD THE INSTRCUCTIONS.
Set the meter to AC ~ or DC -
The 20 200 2000 just sets a decimal place.
Red probe to the hot, black probe to the neutral.
If you get voltage reading but its negative you most likely have
the red probe to neutral and black to hot.
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Why do you still use both ac and DC?
Because some appliances work with ac current and some with dc current.
Why dc series motors cannot be used in home?
DC series motors run on DC power. Homes have AC power, not DC power. You could use DC motors in homes if you have a power supply or use a battery, but it is usually more cost effective to use an AC motor.
What is the difference between in ac and dc powwer cable?
There is no difference in the cables. The only difference is the type of electrical power being transmitted. AC or DC applications use the same wires.
What kind of current used in train?
Trains use DC currents! It's predominantly AC now but more dc in the early days. Both still in use. See DC and AC section below article-
Does electrical transformer use a DC or AC source?
A transformer is a device to convert high voltage AC to low voltage AC & vice-versa. It works on the principle of induction. Since induction occurs only in an AC supply, a transformer cannot work on DC.. So, it is not possible to convert DC supply to AC using transformer. You would need an inverter to convert DC to AC.
How ac change to DC?
by the use of inverter we can convert ac to dc.
How do you know polarity of shunt winding of dc generators?
by using multitester
Does Australia use ac or dc?
240v ac
How can a radio use both DC and AC?
Radios use DC power supplies to operate. If a radio is powered from a mains AC supply, a power supply circuit will convert the AC supply to DC. Therefore, a radio may have both a DC and an AC power input but ultimately, the internal circuitry will always use DC.
Does a car use DC or AC power?
the car use dc current dear
Can you run a DC unit off ac?
no the dc unit will be damaged . but , if you have no other options left then you have to use a rectifier to convert the ac into dc .
How do you increase voltage 5v 12v?
AC or DC? AC - use a transformer, DC - forget it - not simple or cheap.
How do you increase voltage 5v-12v?
AC or DC? AC - use a transformer, DC - forget it - not simple or cheap.
What instruments do AC to dc current use?
I would assume that you mean what devices do you use to convert ac current to dc current?The answer is Diodes.seediode-bridge
Why not you use ac instead of dc to electronic components?
AC is easier and cheaper to send from the generators to the consumers than DC is.
Why do you still use both ac and DC?
Because some appliances work with ac current and some with dc current.
Do cars use AC or DC current?
Most automotive applications use DC, although the alternator is an AC device which uses a rectifier to produce DC. http://en.wikipedia.org/wiki/Direct_current
