# science

what is the current prouce by a potential difference of 240 volts through a resistance of 0.2 ohms?

1. 👍
2. 👎
3. 👁
1. V = i R
240 = i (.2)
i = 240/.2 = 2400/2 = 1200 amps (welding current, big sparks)

1. 👍
2. 👎

## Similar Questions

1. ### Physics

Thanks for any help :) Four 20 ohm resistors are connected in parallel and the combination is connected to a 20V emf device. The current is: A) 0.25A B) 1.0 A C) 4.0 A D) 5.0 A E) 100 E Parallel circuits: I know that the voltage

2. ### Physics

The graph below represents the relatonship between the potential difference across a metal conductor and the current through the conductor at constant temperature. Potential Difference vs. Current PD vs. C PD---C 2----2 4----4

3. ### physics

In a lightning strike, a charge of 18 coulombs is transferred between a cloud and the ground in 2.0 × 10-2 second at a potential difference of 1.5 × 106 volts. What is the average current produced by this strike? 3.6 × 10-1 A

4. ### PHYSICS

An automobile battery has an emf of 12.6 V and an internal resistance of 0.0500 . The headlights together present equivalent resistance 5.60 (assumed constant). (a) What is the potential difference across the headlight bulbs when

1. ### electrical circuit

A 72-ohm coil of wire is connected in series with an adjustable resistor (rheostat) whose resistance can be varied from 0 to 88 ohms. If the line potential is 115 volts, calculate (a) the range through which the coil current can

2. ### physics

a battery has an e.m.f of 6 volts and an internal resistance of 0.4 ohm.it is connected to a 2.6 ohm resistor through a SPST{single pole,single throw}switch.when the switch is closed,the potential difference between the terminals

3. ### Physics

The potential difference across the terminals of a storage battery not connected in any circuit is observed to be 12 V. When it is connected to an external resistance the potential difference across the terminals is observed to be

What is the potential difference if a resistance of 25 ohms produce a current of 250 amperes?

1. ### physics

when you connect an unknown resistor across the terminals of a 1.50 V AAA battery having a negligible internal resistance, you measure a current of 18.0 mA flowing through it .A)what is the resistance of the resistor. B) if you

2. ### math

In physics, Ohm's law says that current through a wire, I, is directly proportional to voltage, V, and inversely proportional to resistance, R: I=V/R. It's also true that resistance is directly proportional to the length of the

3. ### Math

Help po kong paano ma sasagot po eto the current I varies directly as the electromotive force E and inversely as the resistance R. If a current of 30 amperes flows through a system with 16 ohms resistance and electromotive force a

4. ### Calculus

The voltage,V, in an electrical unit is related to the current,I, and the resistance,R, by the equation V=IR. The current is decreasing at -4amps/sec as the resistance increases at 20ohms/sec. How fast is the voltage changing when