By Milton Gussow

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**Extra resources for Schaum's Outline of Theory and Problems of Basic Electricity**

**Example text**

Find the current I. 3A (Given) Do 4-5). What not add is 52 DIRECT-CURRENT SERIES CIRCUITS Step 2. Find the total RT. Add the two RT = R1 = 45 Step 3. Find the total + R2 + 60 = 105R VT. Use Ohm’s law. 5V R, = [CHAP. 4 Ans. 450 20 VT = ? VT 6 n = 95 J I I L@J R2 = 6011 Fig. 4-6 Fig. 4 A 95-V battery is Find across each resistor. in series three resistors: 20Q, 50R, and 120R (Fig. 4-6). Step 1. Find the total RT. RT = R , + Rz + R3 - 20 + 50 + 120 = 190R Step 2. Find the current I. Write Ohm’s law, from we get Step 3.

2 1 1 Fig. 2 1 2 flows from the plus terminal of the battery, through See Fig. 2-12. In the battery of the battery. 69 Write the words the following ( a ) The use of a diagram makes trace the function of a to (b) Examples of letter transformers, (d The point. ( d ) The (e) The (f) Floor-plan diagram are to identify for resistors, for transistors. symbol to show that wires are electrically for at that diagram is often used to show diagram is way to show the relationships of various parts of a are used with electrical systems.

3-1) to find the unknown I. I = VR = -120 - 30 -4A Ans. 42 OHM’S LAW AND POWER [CHAP. 3 Find R when V = 220V and I = 11 A. Use Eq. (3-2) to find the R. 4 Ans. 5 A and R = 2 0 a . Use Eq. (3-3) to find the unknown V. 5 An electric light bulb resistance of the The first step in solving a circuit each of the parts and Ans. 0A when operating on a 120-V dc circuit. the to sketch a schematic diagram of the circuit labeling 3-9). Fig. 3-9 Since I and V are known, we use Eq. (3-2) to solve for R. R = - I= - -120 1 - 120a Ans.