By Dana Bell
Ninety six pages, learn folks army airplane colour schemes from 1926 to 1942, bw and colour illustrations
Read or Download Air Force Colors 1926 - 1942 Vol. I PDF
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Extra resources for Air Force Colors 1926 - 1942 Vol. I
9) (a) Describe with the aid of a sketch the construction of a small capacitor. Give one instance of the use of such a capacitor in a practical circuit, and give reasons for its use. (b) What charge is carried by a 10 µF capacitor when connected to a 240 V DC supply? 22 Electrical craft principles (10) Name one type of capacitor and describe its construction. (11) (a) Describe with the aid of a sketch the construction of a ‘paper’ capacitor. (b) Give one example of the use of this capacitor in a practical circuit, and give reasons for its use.
When the current has fallen to zero, there will be no magnetic flux, no change of flux and no EMF, so the needle of the instrument will return to the zero position. This effect of an EMF being induced in one coil when the current changes in a second coil placed close to it is called mutual induction, and mutual inductance (symbol M) is said to exist between the coils. The unit of mutual inductance is the henry (symbol H) and can be defined in two ways. 1 The mutual inductance between two coils is one henry when current changing in the first coil at a rate of one ampere per second induces an EMF of one volt in the second coil.
12 What is the capacitance of a capacitor which stores energy of 2 J for a potential difference of 240 V? 2 J. 2 V2 = = 4 × 104 10 × 10−6 √ therefore V = (4 × 104 ) volts = 2 ×102 volts = 200 V W = Although the energy stored in a capacitor is small, it is capable of providing a shock to a person touching the terminals, or of causing a fire. A charged capacitor will tend to lose its charge after the charging source is removed by leakage through the dielectric but, to ensure that this process is reasonably fast, a discharge resistor is connected across the terminals of power capacitors.