The current is 2 amps when the resistance is 5 ohms and the voltage is 10 volts.
What is the current through the 5 ohm resistor if the voltage across it is 10v?
Ohm’s law is simple: current equals voltage divided by resistance. Here, 10 volts divided by 5 ohms gives 2 A. Change either number, and the current changes too—double the voltage to 20 V, and you’ll get 4 A. Halve the resistance to 2.5 Ω, and you’ll still get 4 A.
What is the value of resistance at V 10 volts and I 5a?
The resistance is 2 ohms.
Flip Ohm’s law around: resistance equals voltage divided by current. With 10 volts and 5 amps, 10 ÷ 5 = 2 Ω. That’s the same resistance you’d find in a car headlight circuit when a 10 V battery powers a bulb drawing 5 A. Handy for quick mental math.
How do you find current with voltage and resistance?
Ohm’s law is your go-to tool here. Plug in the voltage and resistance, and you get the current. The beauty? It works both ways. Need resistance? Use R = V/I. Need voltage? Use V = I×R. Try it with a 9 V battery and a 3 Ω resistor—you’ll get 3 A, which is enough to power a small LED safely.
What is the current passing through the 5.0 ohm resistor?
This assumes a 12 V drop across the resistor. Divide 12 V by 5 Ω, and you get 2.4 A. Real circuits aren’t perfect, though. Wires and connections add tiny resistances, so always measure the actual voltage drop with a multimeter. That way, you’ll know the real current, not just the theoretical one.
What is the voltage when the resistance is 6 ohms and the current is 8 amps?
Multiply the resistance by the current: 8 A × 6 Ω = 48 V. That’s roughly the combined voltage of four standard car batteries wired in series. Be careful with high voltages like this—always check your multimeter’s range before measuring. A 48 V shock isn’t pleasant.
What is value of current in 5 ohm resistance?
Stick with Ohm’s law: I = V/R. If the supply is 10 V and the resistor is 5 Ω, you get 2 A. That’s way too much for most LEDs, though. Typically, an LED needs only 20 mA. Use a series resistor to limit the current and protect your LED from burning out.
How many ohms does a 12 volt battery have?
The battery itself has essentially zero ohms; the resistance is in the load.
A 12 V battery isn’t a resistor—it’s a voltage source. The "500 ohms" you see in examples? That’s just a made-up load for textbook problems. In real life, your phone charger might have a load of 25 Ω, giving about 0.5 A when plugged into a 12 V source. Batteries don’t resist; they push.
What happens when voltage is increased?
The current increases proportionally.
Ohm’s law says current and voltage are directly proportional when resistance stays the same. Double the voltage, and the current doubles. Halve the voltage, and the current halves. That’s exactly how dimmer switches work—they reduce the voltage to the bulb, which lowers the current and dims the light.
How do I calculate resistance?
Grab your multimeter and measure the voltage across the component and the current through it. Divide the voltage by the current, and you’ve got the resistance. For example, 9 V and 3 A? That’s 3 Ω. Series resistors? Add them up. Parallel resistors? Use the reciprocal formula: 1/R_total = 1/R1 + 1/R2 + …
What is the relation between resistance and current?
Current is inversely proportional to resistance.
Ohm’s law makes this clear: I = V/R. Keep the voltage the same, and resistance and current move in opposite directions. Double the resistance, and the current drops in half. Halve the resistance, and the current doubles. That’s why thick jumper cables can deliver more current to a dead battery than thin ones—they’ve got less resistance.
Is voltage directly proportional to resistance?
No, voltage is not directly proportional to resistance.
Voltage and resistance aren’t tied together unless you’re holding current constant. If you increase resistance while keeping the current the same, the voltage across that resistor must go up (V = I×R). Think of a garden hose: squeeze the end (increase resistance), and the pressure (voltage) at the nozzle rises if the flow (current) stays the same.
Does resistance affect voltage?
Yes, resistance affects the voltage drop across it.
In a simple loop, the resistor “takes” a share of the supply voltage equal to I×R. A 10 Ω resistor on a 12 V supply with 1 A of current drops 10 V. The remaining 2 V appears across any other components in the loop. That’s how voltage dividers work in electronics—resistors split the voltage based on their resistance values.
What is the current through the 2.0 ohm resistor?
This usually comes from a bigger circuit where the 2 Ω resistor has 4.2 V across it. Divide 4.2 V by 2 Ω, and you get 2.1 A. Don’t trust textbook numbers—always measure the actual voltage drop in your own circuit. Wires add tiny resistances that can throw off your calculations.
What is the current through the 20 ohm?
In a parallel branch, every resistor sees the same voltage. If that voltage is 200 V, then I = 200 V ÷ 20 Ω = 10 A. High-power heating elements use low resistance for a reason—10 A through a 20 Ω heater gives 2 kW of heat. That’s serious power.
What is the current through the 30 ohm resistor?
The current is 2.00 amps.
This assumes a 60 V drop across the resistor. Divide 60 V by 30 Ω, and you get exactly 2 A. In lab settings, precision matters. Four significant figures (2.000 A) would mean a carefully calibrated source and measurement system—think lab-grade equipment, not your average multimeter.
