Electric Current through a Microwave Oven – The Physics Factbook

Bibliographic Entry Result
(w/surrounding text)
Standardized
Result
Cutnell & Johnson. Physics. 1998. “A 1650 W toaster, a 1090 W iron, and a 1250 W microwave oven are turned on in a kitchen. As the drawing shows, they are all connected through a 20-A circuit breaker to an ac voltage of 120 V.” 20 A
Energy Through Our Lives. WEEP Education Program. 2002. “The information on the label tells us that the microwave oven needs 120 volts of electricity in the form of alternating current to operate, and draws 5 amps of current during its use.” 5 A
GE Manual. Models: GLMB186KS, GLMB186KB, GLMB186KC. Year:2003.
Installation Requirements:
Power Source 120 AC 60 HZ
Line Current 13.6 Amps 1550 W
Over Current Protection 15-20 Amps
Requires 120 volt, 15-20 amp parallel
Working voltage 108-132 VAC
13.6 A
Encyclopedia of Science and Technology. McGraw Hill. Vol 11. 1982. “The microwave power, supplied by a magnetron is at a frequency of 2.45 GHz with rated power from 350 to 750 Watts.”
[I = P/V = 750 W/120 V = 6.25 A]
[I = P/V = 350 W/120 V = 2.92 A]
2.92 – 6.25 A
Frigidaire FAQ’s. “Microwave oven must be plugged into its own 15 ampere circuit.” < 15 A

Millions of homes in America are equipped with microwave ovens. Why ? Because they cook food fabulously cursorily. A microwave oven is an appliance that uses electromagnetic energy to heat and cook foods. A microwave oven uses microwaves. Microwaves are identical short radio waves normally employed in radar and satellite communications. In microwave ovens the most normally secondhand radio receiver frequency is 2,500 megahertz. When concentrated within a little space, these waves efficiently heat water and other substances within foods. Microwaves cook food quickly because, unlike conventional ovens, they heat only the food and not the air or the oven walls. That is because radio waves are absorbed by waters and fats. The heating system spreads within food by conduction. The microwaves produced pas through most materials well, but they are absorbed by water. The water molecules begin to vibrate quickly and produce heat, which in turn cooks the food .
In a microwave oven, electricity enters the microwave oven through a series of fuse and safety protection circuits. Setting the oven timer and starting a cook operation extends this electric potential way to the control circuits. The see arrangement generates a signal that produces a electric potential path to the high-octane transformer. The high-octane transformer serves to increase the distinctive family voltage, of about 115 volts, to about approximately 3,000 volts. This mighty voltage is merely what the magnetron tube needs to convert the high electric potential into waves of electromagnetic fudge department of energy. The electric stream that passes through a microwave ranges from 5-20 AMPs. If only given power, electric potential, and/or resistance, the current can be found by the equations V = IR and P = IV, where I ( current ) is solved for .
Lindsey Tannenbaum — 2004

Bibliographic Entry Result
(w/surrounding text)
Standardized
Result
SHARP Household Microwave Oven Model R-5A50. Assembled in USA of parts made in USA and Imports. Serial No.159776 Manufactured November 1988. SHARP Electronics Corp. MAHWAH NJ 07430. “12. V.A.C. 7.44 kW 60 Hz Single Phase Output 700 W 2450 MHz. Complies with DHHS Radiation Performance Standards 21CFR Subchapter J.” 5.8 A
Microwave Oven. Encyclopedia.com. 2004. “Typical output power for consumer devices ranges from 650 to 1200 watts.” 5.4–10 A
Davidson, Homer L. Troubleshooting & Repairing Microwave Ovens USA: McGraw-Hill, 1997: 62. “A home oven should have a reading between 1.6 kV and 4.5 kV (equals 160–450 mA.), while commercial ovens have a higher measurement. The voltage might vary from 2.0 kV to 7.0 kV (200–700 mA) of the current. Any oven that reads above these figures indicate a leaky or shorted magnetron tube (Table 2-1).” 0.160–0.700 A
(magnetron tube only)
TABLE 2-1 Microwave oven current and HV chart
Oven Mfg. Current Mfg. Voltage
Litton 160-300 mA 1.9-2.5 kV
Sharp 200-450 mA 1.9-3.5 kV
Tappan 250-325 mA 1.9-2.2 kV
Whirlpool 240-300 mA 2.0-2.5 kV
Sanyo 200-270 mA 1.8-2.3 kV
0.160–0.270 A
(magnetron tube only)
Sprague, Dewey D. A Practical Approach to Microwave Oven Safety. Health Physics Society. 2004. “The high-voltage electrical components (up to 4,000 V DC at 300 mA) are contained in a grounded metal enclosure.” 0.300 A
(magnetron tube only)

Microwave ovens can be found in practically every american family. It is a firm and easy device for reheating food. Though sol many people own a microwave, do they know how one works ?

Microwave ovens use radio waves with a frequency of about 2,500 megahertz to heat food. Water, fats and sugars absorb these radio waves, changing them into inflame. One wyrd thing about radio receiver waves is that not every material will absorb the waves equally. A draw of plastics, looking glass or ceramics wo n’t absorb them. metallic does n’t work well because it reflects radio receiver waves. This is why conductors are not put in the microwave. Sparking can occur and this could lead to something being burned. My parents used to say, “ Uh yeah… that ‘s supposed to happen. It means it ‘s working. ” so unlike what my parents and probably many american idea when they first purchased a microwave, they ca n’t just stick any container in the microwave oven and expect it to work.

Microwave ovens consume ability at a rate of 650–1200 watts, which corresponds to a stream of 5.4–10 amps at 120 volts AC. To convert power to current, use the equation…

P = VI
It is stated that if electrical components with voltage up to 4,000 V DC at 300 mA are in contained in ground metallic element, then the part is safe to use. Does this go for all microwave ovens, new and old ? A interpretation higher than these numbers means that there may be a escape, which is n’t a dear thing and it might not be safe. But then again, how condom are microwave ovens ? Is the convention current itself safe ? If so, why am I told that to be safe, I should stand far enough away while a microwave is on ? ( Courtesy of my land Science teacher who made the stallion classify paranoid. )
Anna Ng — 2004