Example 28.1 Terminal Voltage of a Battery

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Presentation transcript:

Example 28.1 Terminal Voltage of a Battery A battery has an emf of 12V and an internal resistance of 0.05Ω. Its terminals are connected to a load resistance of 3Ω. Find: The current in the circuit and the terminal voltage The power dissipated in the load, the internal resistance, and the total power delivered by the battery

(a) Find the current in each resistor. Three resistors are connected in parallel as shown in Figure 28.7. A potential difference of 18 V is maintained between points a and b. (a) Find the current in each resistor. (b) Calculate the power delivered to each resistor and the total power delivered to the combination of resistors. Active Figure 28.4 (c) The resistors replaced with a single resistor having an equivalent resistance Req = R1+R2.

(c) Calculate the equivalent resistance of the circuit. Figure 28.5 (Quick Quiz 28.4) What happens when the switch is opened?

EX 6. Three resistors are connected in parallel as shown in Figure 28 EX 6. Three resistors are connected in parallel as shown in Figure 28.11a. A potential difference of 18.0 V is maintained between points a and b. (A) Find the current in each resistor.

(B) Calculate the power delivered to each resistor and the total power delivered to the combination of resistors.

Find the currents I1 , I2 , and I3 in the circuit We arbitrarily choose the directions of the currents as labeled in Figure Substituting Equation (1) into Equation (2) gives Dividing each term in Equation (3) by 2 and rearranging gives Subtracting Equation (5) from Equation (4) eliminates I 2 , giving Figure 28.17 (Example 28.9) A circuit containing different branches. The fact that I 2 and I 3 are both negative indicates only that the currents are opposite the direction we chose for them. However, the numerical values are correct.

EX 10

EX 10