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- Electrical and Electronic Principles: [Volume 2]: Vol 2?
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Electrical and Electronic Principles: [volume 2]: Vol 2 - Used. Choose price below. The book provides a set of course notes, freeing the student to spend time learning and doing. Compare Similar Products Set 1 of 1. Electrical Craft Principles: V. Book Description Newnes, Condition: Very Good. Ships from the UK. Former Library book. Great condition for a used book!

Minimal wear. Seller Inventory GRP More information about this seller Contact this seller. Condition: Good. Shows some signs of wear, and may have some markings on the inside.

### 6th Edition

Seller Inventory U A few small marks to page edges Good condition is defined as: a copy that has been read but remains in clean condition. All of the pages are intact and the cover is intact and the spine may show signs of wear. The book may have minor markings which are not specifically mentioned.

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Most items will be dispatched the same or the next working day. Seller Inventory mon Book Description Paperback. The book has been read, but is in excellent condition. Find the current taken by the lamp and its power rating. Electrical equipment in an office takes a current of 13 A from a V supply. Estimate the cost per week of electricity if the equipment is used for 30 hours each week and 1 kWh of energy costs 6p.

Cost at 6p per kWh D An electric heater consumes 3. Power D Problem A 12 V battery is connected across a load having a resistance of Determine the current flowing in the load, the power consumed and the energy dissipated in 2 minutes. A source of e. Power rating of heater D 1. Problem If the fire is on for 6 hours determine the energy used and the cost if 1 unit of electricity costs 6.

A business uses two 3 kW fires for an average of 20 hours each per week, and six W lights for 30 hours each per week. If the cost of electricity is 6.

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Total energy used per week D C 27 D kWh. Thus weekly cost of energy at 6. Now try the following exercise Exercise 7 Further problems on power and energy 1 The hot resistance of a V filament lamp is Determine the current taken by the lamp and its power rating. Find also the power rating of the fire and the energy used in 20 h. Determine the power dissipated by the coil. Determine the cost of electricity for the week if 1 unit of electricity costs 7p.

## Electrical and Electronic Principles

If the fire is on for 30 hours in a week determine the energy used. Determine also the weekly cost of energy if electricity costs 6. If 3 A, 5 A and 10 A fuses are available state which is the most appropriate for each appliance.

The fuse, which is made of material having a low melting point, utilizes the heating effect of an electric current. A fuse is placed in an electrical circuit and if the current becomes too large the fuse wire melts and so breaks the circuit. A circuit diagram symbol for a fuse is shown in Fig.

If 5 A, 10 A and 13 A fuses are available, state which is most appropriate for the following appliances which are both connected to a V supply: a Electric toaster having a power rating of 1 kW b Electric fire having a power rating of 3 kW. Give four examples 9 What is an insulator? The energy consumed by the resistor is: a 0. Resistance, R, is directly proportional to length, l, of a conductor, i. Thus, for example, if the length of a piece of wire is doubled, then the resistance is doubled. Resistance, R, is inversely proportional to crosssectional area, a, of a conductor, i.

Thus, for example, if the cross-sectional area of a piece of wire is doubled then the resistance is halved.

By inserting a constant of proportionality into this relationship the type of material used may be taken into account. The value of the resistivity is that resistance of a unit cube of the material measured between opposite faces of the cube. Resistivity varies with temperature and some typical values of resistivities measured at about room temperature are given below: Copper 1. The resistance of a 5 m length of wire is Determine a the resistance of an 8 m length of the same wire, and b the length of the same wire when the resistance is A wire of length 8 m and cross-sectional area 3 mm2 has a resistance of 0.

If the wire is drawn out until its cross-sectional area is 1 mm2 , determine the resistance of the wire. Resistance R is directly proportional to length l, and inversely proportional to the cross-sectional area, a, i. Since R D 0. A piece of wire of cross-sectional area 2 mm2 has a resistance of Find a the resistance of a wire of the same length and material if the cross-sectional area is 5 mm2 , b the cross-sectional area of a wire of the same length and material of resistance Resistance R is inversely proportional to crosssectional area, a, i.

Calculate the resistance of a 2 km length of aluminium overhead power cable if the cross-sectional area of the cable is mm2. Take the resistivity of aluminium to be 0. Problem 5. Calculate the cross-sectional area, in mm2 , of a piece of copper wire, 40 m in length and having a resistance of 0.

Take the resistivity of copper as 0. The resistance of 1. Determine the resistivity of the wire. Determine the resistance of m of copper cable having a diameter of 12 mm if the resistivity of copper is 1.

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## Basic Electrical and Electronics Engineering

Determine a the resistance of a 7 m length of the same cable and b the length of the same wire when the resistance is 6. Determine a the resistance of a wire of the same length and material if the cross-sectional area is 4 mm2 , and b the cross-sectional area of a wire of the same length and material if the resistance is 32 [ a 5 b 0. Take the resistivity of aluminium as 0.

The temperature of the wire is increased and the resistance rises to If the temperature coefficient of resistance of aluminium is 0. What is the significance of the minus sign? If the temperature coefficient of resistance of nickel is 0. Determine the value and tolerance of a resistor having a colour coding of: orange-orange-silver-brown. The first two bands, i. Determine the value and tolerance of a resistor having a colour coding of: brown-black-brown. Between what two values should a resistor with colour coding brown-black-brown-silver lie?