The

**current**can be found from Ohm's Law, V = IR. The V is the battery voltage, so if R can be determined then the**current**can be calculated. The first step, then, is to find the resistance of the wire: L is the length, 1.60 m.1

## What is the formula to find voltage?

**Ohm's law equation**(formula): V = I × R and the

**power law equation**(formula): P = I × V. P = power, I or J = Latin: influare, international ampere, or intensity and R = resistance. V = voltage, electric potential difference Δ V or E = electromotive force (emf = voltage).

2

## What is the formula for measuring voltage?

In the four tables below, you may enter two of the four factors in Ohm's Law. They are Power (P) or (W),

**measured**in Watts,**Voltage**(V) or (E),**measured**in Volts, Current or Amperage (I),**measured**in Amps (Amperes), and Resistance (R)**measured**in Ohms.3

## How do you calculate watts?

To determine the

**wattage**, use a simple multiplication**formula**. The ampere (or amps) is the amount of electricity used. Voltage measures the force or pressure of the electricity. The number of**watts**is equal to amps multiplied by volts.4

## How can you have voltage without current?

No, water

**would**stay still. Still = no flow = no**current without voltage**. For e.g. a battery**there**is**voltage**even it is not connected anywhere. Thus**voltage**(Potential difference between two points) exists**without current**(flow of charge with respect to time) but**current**doesn't exist**without voltage**.5

## How do you find total current in a series circuit?

Voltage is the same across each component of the parallel

**circuit**. The sum of the currents through each path is equal to the**total current**that flows from the source. You can**find total**resistance in a Parallel**circuit**with the following**formula**: 1/Rt = 1/R1 + 1/R2 + 1/R3 +6

## What is the Ohm's law?

The potential difference (voltage) across an ideal conductor is proportional to the current through it. The constant of proportionality is called the "resistance", R.

**Ohm's Law**is given by: V = I R where V is the potential difference between two points which include a resistance R.7

## How do you calculate ohms?

Enter any two known values and press "Calculate" to solve for the others. For example, a 100 watt light bulb operating on 120 volts AC will have 144

**ohms**of resistance and will draw 0.833 Amps. Enter 100 in the Watts field and 120 in the Voltage field and press Calculate to**find**the resistance and current.8

## What is current in physics?

**Current**is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. Physicists consider

**current**to flow from relatively positive points to relatively negative points; this is called conventional

**current**or Franklin

**current**. Electrons, the most common charge carriers, are negatively charged.

9

## How do you find power in a circuit?

Back to our

**circuit**! To use the**power**rule (P = I × V), we need to know both the current through the resistor, and the voltage across the resistor. First, we use Ohm's law ( V = I × R ), to find the current through the resistor. The voltage across the resistor is V = 9 V.10

## What is the relationship between voltage and current?

The relationship between voltage, current, and resistance is described by

**Ohm's law**. This equation, i = v/r, tells us that the current, i,**flowing**through a circuit is directly**proportional to**the voltage, v, and inversely**proportional to**the resistance, r.11

## How do you find energy?

**Part 2**

**Calculating Kinetic Energy**

- Write the equation. The formula for calculating kinetic energy (KE) is KE = 0.5 x mv
^{2}. - Plug the mass and velocity into the equation. If you don't know the mass or velocity of the object, then you'll have to calculate it.
- Solve the equation.

12

## How do you calculate amps?

The formula for Volts is Watts divided by

**Amps**. To use the chart, cover up the V with your finger and use the remaining chart**calculation**of W divided by A. Using our sample panel data, 60 watts divided 5**Amps**equals 12 Volts. The formula for**Amps**is Watts divided by Volts.13

## How do you calculate the total current?

**Part 2**

**Finding Total Current of a Series Circuit Connection**

- Find the total resistance of the circuit.
- Identify the total voltage of the resistor.
- Calculate the total current of the system.
- Remember Ohm's law.
- Try working with an example.
- Use Ohm's Law for computing the total current:

14

## How do you measure a current?

It is

**measured**in the unit of the Ampere, simply called “Amp,” (A). The most common way to**measure current**in a circuit is to break the circuit open and insert an “ammeter” in series (in-line) with the circuit so that all electrons flowing through the circuit also have to go through the meter.15

## What is the measure of voltage?

Voltage is a measure of the difference in electrical energy between two parts of a circuit. The bigger the difference in energy, the bigger the voltage. Voltage is measured in volts. The symbol for volts is V. For example,

**230V**is a bigger voltage than 12V.16

## How does AMPS work?

Voltage is measured in volts, current is measured in

**amps**and resistance is measured in ohms. A neat analogy to help understand these terms is a system of plumbing pipes. The voltage is equivalent to the water pressure, the current is equivalent to the flow rate, and the resistance is like the pipe size.17

## What is voltage in physics?

**Voltage**is electric potential energy per unit charge, measured in joules per coulomb ( = volts). It is often referred to as "electric potential", which then must be distinguished from electric potential energy by noting that the "potential" is a "per-unit-charge" quantity.

18

## What is the unit of current?

The

**SI unit**for measuring an electric current is the**ampere**, which is the flow of electric charge across a surface at the rate of one coulomb per**second**. Electric current is measured using a device called an ammeter.19

## What is power measured in?

The dimension of power is energy divided by time. The SI unit of power is the watt (W), which is equal to one joule per second. Other units of power include ergs per second (erg/s),

**horsepower**(hp), metric**horsepower**(Pferdestärke (PS) or cheval vapeur (CV)), and foot-pounds per minute.