Quick Answer: What Causes Resistance?

Is resistance directly proportional to heat?

In your equation, the voltage and resistance are not independent quantities, but voltage is a function of resistance and the current flowing through it.

Then the equation reads H=I2Rt, which tells us that heat is directly proportional to resistance..

Does higher resistance mean more heat?

When current flows through a conductor, heat energy is generated in the conductor. The heating effect of an electric current depends on three factors: The resistance, R of the conductor. A higher resistance produces more heat. … the higher the current the larger the amount of heat generated.

What is an example of antibiotic resistance?

Important examples are: methicillin-resistant Staphylococcus aureus (MRSA) vancomycin-resistant Enterococcus (VRE) multi-drug-resistant Mycobacterium tuberculosis (MDR-TB)

What affects resistivity of a wire?

First, the total length of the wires will affect the amount of resistance. The longer the wire, the more resistance that there will be. … Second, the cross-sectional area of the wires will affect the amount of resistance. Wider wires have a greater cross-sectional area.

How can we prevent antibiotic resistance?

There are many ways that drug-resistant infections can be prevented: immunization, safe food preparation, handwashing, and using antibiotics as directed and only when necessary. In addition, preventing infections also prevents the spread of resistant bacteria.

Does temperature affect resistance?

Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. … Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.

Is voltage directly proportional to resistance?

In the first version of the formula, I = V/R, Ohm’s Law tells us that the electrical current in a circuit can be calculated by dividing the voltage by the resistance. In other words, the current is directly proportional to the voltage and inversely proportional to the resistance.

The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.

What are the factors that affect resistance?

There are several factors that affect the resistance of a conductor;material, eg copper, has lower resistance than steel.length – longer wires have greater resistance.thickness – smaller diameter wires have greater resistance.temperature – heating a wire increases its resistance.

What are 4 factors that determine resistance?

There are 4 different factors which affect resistance:The type of material of which the resistor is made.The length of the resistor.The thickness of the resistor.The temperature of the conductor.

What happens to resistance when current increases?

The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.

Why is resistance directly proportional to length?

As the length increases, the number of collisions by the moving free electrons with the fixed positive ions increases as more number of fixed positive ions are present in an increased length of the conductor. As a result, resistance increases.

Is resistance directly proportional to temperature?

The resistance increases as the temperature of a metallic conductor increase, so the resistance is directly proportional to the temperature.

How common is antibiotic resistance?

Antibiotic resistance is one of the biggest public health challenges of our time. Each year in the U.S., at least 2.8 million people get an antibiotic-resistant infection, and more than 35,000 people die.

How do you get the resistance?

Ohms Law and PowerTo find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)

What is the biggest cause of antibiotic resistance?

The main cause of antibiotic resistance is antibiotic use. When we use antibiotics, some bacteria die but resistant bacteria can survive and even multiply. The overuse of antibiotics makes resistant bacteria more common. The more we use antibiotics, the more chances bacteria have to become resistant to them.

Is antibiotic resistance reversible?

Yes, antibiotic resistance traits can be lost, but this reverse process occurs more slowly. If the selective pressure that is applied by the presence of an antibiotic is removed, the bacterial population can potentially revert to a population of bacteria that responds to antibiotics.

Why resistance decreases with increase in area?

The longer a wire is the more resistance it has due to the longer path the electrons have to flow along to get from one end to the other. The larger the cross sectional area, the lower the resistance since the electrons have a larger area to flow through.

What is the main cause of resistance?

Resistance is caused in a conductor by the free electrons. These free electrons collide with each other and with the ions and atoms that oppose their free movement.

What increases resistance in a circuit?

There is a resistance to the flow of an electric current through most conductors . The resistance in a wire increases as: the length of the wire increases. the thickness of the wire decreases.