Current 1. A wire carried a current of 120A for 37s. Calculate the total charge

Question

Current 1. A wire carried a current of 120A for 37s. Calculate the total charge that passed by. Resistance 2. A 1200 resistor is connected to a 48V solar panel. Calculate the current. 3. A small toaster is rated at 8A for 120V. Calculate its resistance. Power 4. 0.01A flows through a 1.5V flashlight bulb. Calculate the power in the bulb. 24V is connected across a 4.7 resistor. Calculate the power in the resistor 6. 135W of power is delivered to a 5202 resistor. a) Calculate the voltage across the resistor. b) Calculate the current flowing through the resistor. c) By what factor does the power increase if the voltage is doubled?

Explanation / Answer

1)

Given:

I = 120 A

t = 37 s

use:

Q = I*t

= 120 A * 37 s

= 4440 C

Answer: 4440 C

2)

Given:

V = 48 V

R = 1200 ohm

use:

I = V/R

= 48 V / 1200 ohm

= 0.040 A

Answer: 0.040 A

3)

Given:

I = 8 A

V = 120 V

use:

R = V/I

= 120 V / 8 A

= 15 ohm

Answer: 15 ohm

I am allowed to answer only 1 question at a time

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