2nd October 2019

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14

What is the potential difference across the resistor?

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If no internal resistance is present in voltage supply, the potential difference across the resistor is equal to supply voltage. Now imagine the same circuit but total current is given as 0.1A . The potential difference is V=IR=0.1*5=0.5V, which basically means the statement above is incorrect.

What happens when you increase the potential difference?

Current, potential difference and resistance. The size of the current flowing in a circuit depends on the potential difference (voltage) driving it and the amount of resistance it has to flow through. For a fixed resistance the amount of current increases with increasing potential difference.

Is the potential difference the same in a parallel circuit?

In parallel circuits, the electric potential difference across each resistor (ΔV) is the same. In a parallel circuit, the voltage drops across each of the branches is the same as the voltage gain in the battery. Thus, the voltage drop is the same across each of these resistors.

1

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.

2

How do you find the resistance?

Use these values in Ohm's Law. If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm's Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance R_T = 9 volts / 3 amps = 3 Ω.

3

When the resistance in a circuit is doubled the current will?

Ohm's law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.

4

What is the emf of the battery?

Electromotive Force and Internal Resistance. The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.

5

What happens to the potential difference in a parallel circuit?

In parallel circuits, the electric potential difference across each resistor (ΔV) is the same. In a parallel circuit, the voltage drops across each of the branches is the same as the voltage gain in the battery. Thus, the voltage drop is the same across each of these resistors.

6

What are the units of potential difference?

The standard metric unit on electric potential difference is the volt, abbreviated V and named in honor of Alessandro Volta. One Volt is equivalent to one Joule per Coulomb.

7

Is there a difference between voltage and potential difference?

Actually these are are same thing but usage is at different places. Whenever we talk about batteries or a DC system, we use the Potential difference, as there is potential difference of 3.7 Volt. Voltage is used as Output from an electrical machine.

8

What is the resistance of a resistor?

The function of a resistor is to oppose the electric current through it. This is called electrical resistance, and is measured in the unit ohm. The resistance can be calculated with Ohms law, when the current is known and the voltage drop is measured: The resistance of a resistor is dependent on its material and shape.

9

What is the definition of voltage drop?

Voltage drop is defined as the amount of voltage loss that occurs through all or part of a circuit due to impedance. A common analogy used to explain voltage, current and voltage drop is a garden hose. Voltage is analogous to the water pressure supplied to the hose.

10

How do you measure resistance?

Method 1 Measuring Resistance with a Digital Multimeter

Choose the item whose resistance you wish to measure.
Plug the test leads into the correct test sockets.
Turn on the multimeter and select the best testing range.
Touch the multimeter leads to the ends of the component you are testing.
Turn off the multimeter.

11

What is the total voltage in a series circuit?

In a series circuit, the current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component. In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents through each component.

12

How do you find current in a series circuit?

UNDERSTANDING & CALCULATING SERIES CIRCUITS BASIC RULES

The same current flows through each part of a series circuit.
The total resistance of a series circuit is equal to the sum of individual resistances.
Voltage applied to a series circuit is equal to the sum of the individual voltage drops.

13

What is a potential difference in a circuit?

The potential difference between two points in an electric circuit is the work done when a coulomb of charge passes between the points. You can calculate the size of a potential difference using this equation: V = W ÷ Q. V is the potential difference in volts, V. W is the work done (energy transferred) in joules, J.

14

What is an ammeter used to measure?

An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.

15

How do you work out the voltage?

Step 3: Use Ohm's law to calculate the voltage across each resistor:

identify formula(using the triangle): V = I x R.
insert numbers for resistor 1: V₁ volts = 0.5A x 1Ω = 0.5 Volts.
insert numbers for resistor 2: V₂ volts = 0.5A x 4Ω = 2.0 Volts.

16

What is the formula of resistance?

The resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A): Since the current is set by the values of the voltage and resistance, the Ohm's law formula can show that: If we increase the voltage, the current will increase.

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Do resistors in parallel have the same potential difference?

When resistors are connected in parallel, the supply current is equal to the sum of the currents through each resistor. In other words the currents in the branches of a parallel circuit add up to the supply current. When resistors are connected in parallel, they have the same potential difference across them.

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How do you find the voltage?

Part 3 Calculating Voltage across a Resistor (Parallel Circuit)

Understand parallel circuits.
Think about how the current flows.
Use the total voltage to find the voltage across each resistor.
Calculate the total current of the circuit.
Compute the total resistance of the circuit.
Find the voltage from your answers.

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What is the unit of resistance?

ohm

20

How do you calculate the charge?

Charge, current and time. Electrical charge is measured in coulomb (C). The amount of electrical charge that moves in a circuit depends on the current flow and how long it flows for. For example, if a current of 10 A flows for 30 s, then 10 x 30 = 300 coulombs of electrical charge moves.

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