# Ohm's law - practice problems

Ohm's law states that the current through a conductor (or resistor) between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, it arrives at the usual mathematical equation I = U/R or I=V/R#### Number of problems found: 63

- Cross-section 71254

The steel conductors of the long-distance power line have a cross-section of 5 cm². Calculate the resistance of a steel wire with a length of 2 km if the resistivity of the steel is 13 * 10-8 kΩ · m. - A fan

A fan with a resistance of 20 Ω is connected to a power supply. The current flowing through the circuit is 2.5 A. What is the voltage of the power supply? - Resistance 66074

Determine the current flowing through the car's starter, whose resistance is 60 milliohms at 12V - Resistances 66064

Two resistors with resistances of 40 ohms and 60 ohms are connected in series and connected to a voltage of 150V. A) the total resistance B) current in the circuit C) voltage on both resistors - Resistance 66054

The handset has a resistance of 4000 ohms. Calculate what voltage is connected to them if the current passes 2.5mA. - Conductor resistance

Calculate the resistance value of the electrical conductor if it is connected to a voltage of 12 V and an electric current of 0.3 A passes through it. - Resistance 62104

The iron is connected to a 230 V power supply and has a current of 5000 mA. Calculate the electrical resistance of the iron. - Electrical 61534

A current of 5 mA flows through a resistor with an electrical resistance of 600 Ω. What electrical voltage do we measure between the resistor terminals? - Voltage - Kirchoff laws

At a voltage of 2.5V, a current I1= 20mA flows through the resistor. What will be the voltage at the ends of the resistor when the current I2= 1,2A passes through it? - Resistance 58091

Does the copper conductor have a resistance of 2.8Ω at 36 ° C. What will be the resistance value after cooling to -22 ° C? - Cooker spiral

A current of 4.4 A flow through the spiral of the electric cooker at a voltage of 220 V. What is the resistance of the spiral? - Manganin

How long must a manganin wire with a diameter of 0.8 mm have to have a value of 10Ω? - Direction indicator

As that which the electrical voltage is connected to the lamp direction indicator 7400 mOhm resistance when current of 1.6 A passes through it? - Resistance 49711

The car's low beam bulb filament has a resistance of 5 Ω. How much electric current flows through it at the standard car battery voltage of 12 V? - Three resistors

You have to connect three identical resistors with 12 Ohm resistances so that you gradually get the resulting resistance a) 36 Ohm, b) 4 Ohm, 18 Ohm. Draw a diagram of each circuit. - Resistor

Resistor 1 with a resistance of 100 Ohms and resistor 2 with a resistance of 400 Ohms are connected side by side in the circuit. There is a voltage of 80V between the resistor terminals. a) Draw a circuit diagram and write the entered quantities in it b) - Electrical 44931

A current of 20 A passes through the heating spiral of the electric fireplace with a resistance of 10Ω for 2.5 hours. Determine the power input of the fireplace and the consumed electrical energy - Resistance 44921

The bulb's resistance at a power input of 40 W is 10 Ω. To what voltage source is it connected? How much current is flowing through it? - Circuit voltage

Calculate the closed-circuit voltage. Calculate the power on the resistors. R1 = 30 ohms, R2 = 10 ohms. I = 0.1A. U =?. The resistors are connected in series, one after the other. - Protector 37111

1. Describe the path through which the current causing the injury flows. 2. Justify why we should use the lowest type of protector A in our country.

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