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What is the resistance of a toaster if 120 V produces a current of 4.2 A?
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∙ 12y ago
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∙ 12y ago
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How will the current change if the voltage in a circuit is held constant while the resistance halves?
Using Ohm's law E = I x R. R = E/I 120/10 = 12 ohms, I = E/R 120/6 = 20 amps. Resistance cut in half, current doubles.
What will happen if the voltmeter was inserted in place of an ammeter?
You would load the circuit, and it is likely it would not operate correctly. A volt meter is designed to have a very high resistance between the two probes; an ammeter is designed to have a very low resistance. For instance, say you have a 120 watt light bulb that runs on 120 volts (you would then draw ~1 amp of current). If you tried to measure this with a meter that has .1 ohm resistance on ammeter setting, and 1,000,000 ohms on volt meter: Error due to loading: ammeter: .1 / (120 + .1) = .08%; Current will be .999Amps, power to the light bulb will be 119.9 watts Volt meter: 1,000,000/ (120 + 1,000,000) = 99.9%; current will be 120micro Amps, power to the light bulb will be 14.4 milliwatts (the light bulb will not appear to be on).
How many watts in 1 volt?
The question doesn't make sense. Watts are the product of volts and amps so you could have 1 V with a current of 1 amp = 1 watt or 10V and a current of 0.1 amps = 1 watt or 100V and a current of 0.01 amps = 1 watt etc.
How many ohms is a 120 volts?
"Volts" is electrical pressure applied to a circuit; whereas, "ohms" is electrical resistance to that pressure. One cannot determine ohms from voltage without knowing either the current (in "amps") or power (in "watts"). A normal 120V household circuit can handle a maximum of 20 amps, so using ohm's law of resistance = voltage / current, the minimum resistance required in a 120V household circuit would be 6 ohms. Any less than 6 ohms will cause the circuit breaker to trip.
Calculate the resistance of a bulb that draws 0.6 A of current with a potential difference of 3 V?
V = I.R R = V/I R = 110/0.5 R = 220 Ohms
A toaster draws 8 A of current with a voltage of 120 V?
The voltage is the main power of a toaster!! but if the current flow is low the heat of the toaster is less heat that you expect, the 8 A is right for your toaster!!!
How much current flows through a toaster with a resistance of 14 ohms when it is connected to a 120 volt outlet?
I = E / R = 120 / 14 = 8.571 Amp. (rounded)
What is the voltage of a circuit in a toaster with 12.0 amps of current and 8.0 ohms of resistance?
The formula you are looking for is Ohm's Law. Voltage = Current x Resistance (v = I x R). To solve for Current the formula is I = V/R.
What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?
Power (watts) = current (amperes) * voltage (volts) Current (amperes) = voltage (volts)/resistance (ohms) 120 watts = current * 120 volts current = 1 ampere 1 ampere = 120 volts/resistance resistance = 120 ohms
How many watts is a toaster?
You can usually find the number of volts (and watts) on a sticker under your toaster. My toaster can hold 4 pieces of toast, and uses 120 volts, but it will vary for different toaster companies, and sizes of the toaster.
What is the electrical power of a toaster that uses a current of 15 A and a voltage of 120 V?
Multiplying 15 amps x 120 volts gives you 1800 watts, or the power consumed by the toaster
What is the resistance of a 120 volt lamp draws 0.25 amperes of current?
v/i=r so 120/0.25=480 480 ohms is the resistance
How can you tell the wires of a toaster have high Resistance?
They get red-hot, but the fuse does not blow, nor the breaker trip. Lower resistance wire fed with 120 volts might draw enormous current and get red hot, but the fuse would blow, or the breaker trip. Of course, You could always whip out your trusty multimeter and measure the resistance (allowing for change with temperature rise of course). Or, you could measure the voltage, then the current, then divide voltage by current to get resistance (at operating temperature).
What is the amperage in an electric circuit when the voltage 120 volts and the resistance is 40 ohms?
Ohm's Law states Voltage = Current x Resistance. You rewrite the equation as Current = Volts / Resistance to solve for current.
What is the resistance of a circuit with 120V and 10A?
Assuming DC and resistive loads, resistance equals voltage across the load, divided by the current through it. In this case 120/10 or 12 ohms.
What is the resistance of a clothes iron that draws a current of 12A at 120V?
By Ohm's Law Voltage = Current x Resistance R = V / I = 120 / 12 = 10 Ohms
What is a resistance of the appliance If 24 amps of current flows through an appliance connected to a 120 v circuit.?
Let R be the resistance, V the voltage, and I the current R = V / I R = 120 / 24 R = 5 ohm
