Fundamentals of Physics + Ohm's law - practice problems
Number of problems found: 17
- 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?
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?
- 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.
- Copper winding
Calculate the current flowing through the copper winding at an operating temperature of 70°C. Celsius, if the winding diameter is 1.128 mm and the winding length is 40 m. The winding is connected to 8V.
- Current in the conductor
Calculate the current in the conductor (in mA) if it is connected to a 4.5 V voltage source and its resistance is 20 (ohm).
- Two resistors
Two resistors 20 Ω and 60 Ω are connected in series and an external voltage of 400 V is connected to them. What are the electrical voltages on the respective resistors? Please comment!
- Lowest voltage
Three resistors with resistors R1 = 10 kΩ, R2 = 20 kΩ, R3 = 30 kΩ are connected in series and an external voltage U = 30 V is connected to them. On which resistor is the lowest voltage?
Solve the textbook problems - transformer: a) N1 = 40, N2 = 80, U2 = 80 V, U1 =? b) N1 = 400, U1 = 200 V, U2 = 50 V, N2 =?
- R1+R2 in parallel
The resistance ratio of the first and second resistors is 3: 1 and the current flowing through the first resistor is 300 mA. What current flows through the second resistor (resistors connected in parallel)?
- Resistance - ohms
If the resistance of the first resistor is 300 ohms and the resistance of the second resistor is 100 ohms. What is the resulting resistance?
- Serial connection
If the voltage on the first resistor is 6 V and the resistance ratio of the first and second resistors is 1: 3, what will be the voltage across the second resistor if they are connected in series?
- The appliance
The appliance has a power input of 2.3 kW and is connected to the mains voltage of 230 V. What is the current flowing through the appliance?
- Filament of bulb
The filament of bulb has a 1 ohm resistivity and is connected to a voltage 220 V. How much electric charge will pass through the fiber when the electric current passes for 10 seconds?
- Coil as a girl
The electrical resistance of the copper wire coil is 2.0 ohms. What current runs through the coil when the voltage between the terminals is 3.0 V?
- Resistance of the resistor
The resistor terminals have a voltage of 20 V and a current of 5 mA is passed through. What is the resistance of the resistor?
Determine the resistance of the bulb with the current 200 mA and is in a regular lamp (230V).
Fundamentals of Physics - practice problems. Ohm's law - practice problems.