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A portable electric heater has a resistance of 8 ohms it plugs into a wall outlet that is 120v how much current in amps does it draw?
Wiki User
∙ 13y ago
The formula we need to use is called "Ohm's Law":
E = I x R
which can also be stated as:
R = E / I
or as:
I = E / R
where I = current (amps), E = potential difference (volts) and R = resistance (ohms),
"x" means "multiply by" and "/" means "divide by".
So, using the values stated in the question, the current I = 120 volts / 15 ohms = 8 amps.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoWell this is just the use of OHM's law. That being said you take your volts of 120 and divide it by the resistance of 8 ohms. There should be something on the electric heater telling you how many watts it is. But by OHM's law again it would be W = A x V.
Wiki User
∙ 14y agoAn 8 Ohm heater connected on a 120 Volt circuit should draw 120/8 or 15 Amperes.
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What is the voltage of a small electric heater if the heater is drawing 12 amperes and has a resistance of 10 ohms?
Voltage is current times resistance, 1.2 x 110 = 132 volts.
When a single phase supply connect to a electric heater short circuit not there why?
The electric heater is basically a resistor, designed to have the right resistance to draw the required current. So a 2 kW heater designed for a 230 v supply is really a resistor of 28.8 ohms, so when it's connected the current is 8 amps and the power is 2 kW.
What is the voltage across an electric water heater element that has a resistance of 32 ohms when the current through it is 6.8A?
It is 6 times 8 and the answer is in volts.
Does the resistance of heater coil remains same when current flows through it?
Typically resistance rises with temperature.
What does high or low voltage do to the capacity of an electric heater?
Yes, voltage effects the output of electric heaters. The wattage output rating of the heater will not be reached due to the lower applied voltage. For example if the heater is 5000 watts at 277 volts, the current is I = W/E 5000/277 = 18 amps. The resistance of the heater is R = W/I (squared) = 5000/18 x 18 (324) = 15.43 ohms. Applying 220 volts on the same heater whose resistance is 15.43 ohms results in this new heater wattage rating. W = E (squared)/R = 220 x 220 (48400)/15.43 = 3137 watts. W = watts, I = amperage, R = resistance in ohms and E = voltage.
Why does the cord of an electric heater not glow while the heating element does?
The heating element of an electric heater is a "resistor", the cord which conducts the electricity is not. The resistance of the element of an electric heater is very high. As current flows through the heating element, it becomes red hot and glows. On the other hand, the resistance of the cord is low. It does not become red hot when current flows through it.
What is the voltage of a small electric heater if the heater is drawing 12 amperes and has a resistance of 10 ohms?
Voltage is current times resistance, 1.2 x 110 = 132 volts.
How much current will an electric heater draw from a 110-volt line if the resistance of the heater when hot is 26.7 ohm?
4.12A. V=IR
Mr Heater F274800 Portable "Big Buddy" Heater is a electric heater?
Mr Heater F274800 Portable "Big Buddy" Heater is a propane gas heater.
Does an electric motor have different resistance than an electric heater?
Yes it would be unlikely an electric motor coincidentally exactly matched the resistance of an electric heater.
Why are wires supplying electric current to the water heater thicker than those supplying current to the lights?
the water heater operates at high power compared to the lights and so the water heater requires a larger current. The wires supplying current to the water heater are thicker so that the wires have a low resistance. This reduces the risk of the wires overheating.
Electric Hot Water Heater?
form_title= Electric Hot Water Heater form_header= Install an electric hot water heater. Is your current water heater electric?*= () Yes () No How old is your home?*= _ [50] What is your current monthly electric bill?*= _ [50]
Does increasing the voltage to an electric heater increase the amperage it draws?
It will increase the current since the water heater is made of a heating element and which is resistive in nature. Ohms law states that V=IR where V is the voltage, I the current and R the resistance. Now the resistance will always remain constant. Thus, when the voltage is increased, the current will also increase.
When a single phase supply connect to a electric heater short circuit not there why?
The electric heater is basically a resistor, designed to have the right resistance to draw the required current. So a 2 kW heater designed for a 230 v supply is really a resistor of 28.8 ohms, so when it's connected the current is 8 amps and the power is 2 kW.
What is stepped resistor?
The resistance that controls a heater motor in the electric system .
Examples of heating effect of electric current?
-kettle -electric heater that's all i have! :)) When a current passes through a wire, the wire heats up. This is caused by the conversion of electrical energy into heat energy. /the heat produced depends on the resistance of the wire.
Why is it important that the resistance of an extension cord used to power an electric heater be kept low?
An electric heater is one of the high-power appliances in a house, commonly taking 1.5 to 3 kilowatts of power. The current is high, and therefore there is a drop in the voltage applied to the heater equal to the current multiplied by the resistance of the cord. There is probably little power wasted, because any heat from the cord goes to heat up the same room. But a voltage drop causes the heater to draw less current because its resistance is constant, and therefore less total power is provided to heat the room. If the heater is thermostatically controlled so that it is not working all the time, the difference is small because any reduction in the heater's power would cause the thermostat to keep it going for longer, to compensate.
