Answer: Tl = - 13.3°C
the lowest outdoor temperature is - 13.3°C
Explanation:
Given that;
Temperature of Th = 21°C = 21 + 273 = 294 K
the rate at which heat lost is Qh = 5400 kJ/h°C
the power input to heat pump Wnet = 6 kw
The COP of a reversible heat pump depends on the temperature limits in the cycle only, and is determined by;
COPhp = Th/(Th - Tl)
COPhp = Qh/Wnet
Qh/Wnet = Th/(Th -Tl)
the amount of heat loss is expressed as
Qh = 5400/3600(294 - Tl)
the temperature of sink
( 5400/3600(294 - Tl)) / 6 = 294 / ( 294 - Tl)
now solving the equation
Tl = 259.7 - 273
Tl = - 13.3°C
so the lowest outdoor temperature is - 13.3°C
Answer:
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According to the basic principles of Electrical Resistance Welding, Resistance welding is used to fuse two metals together. See further explanation below.
<h3>Principles of Electrical resistance welding</h3>
It is to be noted that Electrical Resistance Welding comprises a welding head that exerts pressure and holds the metal between its electrodes, as well as a welding power source that applies electric current to the metal to be welded. When force is exerted, resistance creates friction heat.
A weld is a metal coalescence formed by heating to an appropriate temperature with or without pressure, and with or without the introduction of a filler substance.
Resistance welding bonds are classified into three types:
- solid state,
- fusion, and
- reflow braze.
Different materials having dissimilar grain structures, such as molybdenum to tungsten, are bonded utilizing a relatively short heating time, high weld energy, and high force in a solid state bond, also known as a thermo-compression bond.
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Answer:
C. 3325 Ω - 3675 Ω
Explanation:
5% of 3500 Ω is ...
0.05 × 3500 = 175
The lower limit is this amount less than the nominal value:
3500 -175 = 3325
The upper limit is the nominal value plus the tolerance:
3500 +175 = 3675
The lower and upper limits are 3325 Ω and 3675 Ω, respectively.
The circuit that may not be used to determine the value of the resistor is (Option A). See the attached image.
<h3>
What is a resistor?</h3>
A resistor is a component of an electronic circuit that restricts or regulates the passage of electrical current.
Resistors can also be used to supply a fixed voltage to an active device such as a transistor.
<h3>What is the purpose of a resistor?</h3>
A resistor is a two-terminal electrical component that offers resistance to current flow. Resistors are commonly employed in electrical circuits to reduce current flow, split voltages, impede transmission signals, and bias active parts.
<h3>
What is a circuit?</h3>
Individual electronic components such as resistors, transistors, capacitors, inductors, and diodes are linked by electrical wires or traces through which electric current can pass to form an electronic circuit.
Learn more about circuits:
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