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1. A battery having an emf of 11.00 V delivers 112 mA when connected to a 67.0 load. Determine the internal resistance of the battery.

_____Ω

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2. What is the equivalent resistance of the combination of identical resistors between points a and b in the figure below?

____R

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3. Three 10.0 Ω resistors are connected in series with a 9.0 V battery. Find the following.

(a) the equivalent resistance of the circuit

_____Ω

(b) the current in each resistor

_____A

(c) Repeat for the case in which all three resistors are connected in parallel across the battery.

equivalent resistance

_____Ω

current in each resistor

_____A

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4. Consider the circuit shown in the figure below. (R = 19.0 Ω.)

(a) Find the current in the R = 19.0 Ω resistor.

_____A

(b) Find the potential difference between points a and b.

_____V

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5. (a) Find the current in a 6.00 Ω resistor connected to a battery that has an internal resistance of 0.40 Ω if the voltage across the battery (the terminal voltage) is 21.00 V.

_____A

(b) What is the emf of the battery?

_____V

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6. The figure below shows a circuit diagram. (R

_{1}= 1460 , R

_{2}

(a) Determine the current.

_____mA

(b) Determine the potential of wire A relative to ground.

_____V

(c) Determine the voltage drop across the 1460 resistor.

_____V

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7. Consider the combination of resistors shown in the figure below.

(a) Find the equivalent resistance between point a and b.

_____Ω

(b) If a voltage of 41.9 V is applied between points a and b, find the current in each resistor.

12 Ω _____A

6 Ω _____A

5 Ω _____A

4 Ω _____A

8 Ω _____A

Updated Video for problem number 7 (3/16/2017) (love all of the regulars! Subscribe on youtube and follow my plan to take over the medical school world (board exams in about 1 month!)

Original (Shorter) Video for #7 is below.

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8. The ammeter shown in the figure below reads 1.50 A. Find I

_{1}

, I

_{2}, and ε. (Assume R = 7.50 Ω.)I

_{1}= _____A

I

2 = _____Aε= _____V

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9. In the circuit of the figure below, the current I

_{1}

is 3.4 A and the values of ε and R are unknown. What are the currents I

_{2}and I

_{3}?I

_{2}

= _____AI

_{3}

= _____A

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10. An uncharged capacitor and a resistor are connected in series to a source of emf. If ε = 7.00 V, C = 25.0 µF, and R = 100 Ω, find the following:

(a) the time constant of the circuit

_____s

(b) the maximum charge on the capacitor

_____µC

(c) the charge on the capacitor after one time constant

_____µC

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11. Consider a series RC circuit for which R = 4.0 MΩ, C = 8.0 µF, and ε = 25 V. Find the charge on the capacitor 10 s after the switch is closed.

_____µC

_____µC

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12. A charged capacitor is connected to a resistor and a switch as in the figure below. The circuit has a time constant of 1.00 s. Soon after the switch is closed, the charge on the capacitor is 80.0% of its initial charge.

(a) Find the time interval required for the capacitor to reach this charge.

_____s

(b) If R = 220 kΩ, what is the value of C?

C = _____µF

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13. What minimum number of 100 W lightbulbs must be connected in parallel to a single 180 V household circuit to trip a 40.0 A circuit breaker?

_____lightbulbs

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Hi for #4 how do you find the potential difference? Sorry if I didn't catch it.

ReplyDeletePotential Difference = I X Req

DeleteThe equivalent resistance of all resistors in between point "a" and point "b" is "Req" and I is the current at point "a"

this website helps so much thankyou. your awesome

ReplyDelete