# Download Current - St John Brebeuf

Survey
Was this document useful for you?
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Nanofluidic circuitry wikipedia, lookup

Josephson voltage standard wikipedia, lookup

Transistor–transistor logic wikipedia, lookup

Galvanometer wikipedia, lookup

Schmitt trigger wikipedia, lookup

Test probe wikipedia, lookup

Negative resistance wikipedia, lookup

Power electronics wikipedia, lookup

CMOS wikipedia, lookup

Valve RF amplifier wikipedia, lookup

RLC circuit wikipedia, lookup

Operational amplifier wikipedia, lookup

Wilson current mirror wikipedia, lookup

Power MOSFET wikipedia, lookup

Two-port network wikipedia, lookup

Switched-mode power supply wikipedia, lookup

Surge protector wikipedia, lookup

Multimeter wikipedia, lookup

TRIAC wikipedia, lookup

Resistive opto-isolator wikipedia, lookup

Opto-isolator wikipedia, lookup

Electrical ballast wikipedia, lookup

Network analysis (electrical circuits) wikipedia, lookup

Rectiverter wikipedia, lookup

Current source wikipedia, lookup

Current mirror wikipedia, lookup

Ohm's law wikipedia, lookup

Transcript
```Name_______________________
Date_____________________
Block ____
Ohm’s Law- A Calculating Personality!
Complete the following table. The table has been partially completed to help you.
Name and Abbreviation
Current
Symbol
(A)
Unit
Meter used for
measurement
Formula
I
V= I x R
____________ (R)
ohm
Provide two calculations to prove what happens if a variable is changed in each question.
The first one is done for you.
1. What happens to the current if resistance is increased in a circuit?
I = V/R
I=6/3
I=2A
The current DECREASES
I = V/R
I = 6/5
I = 1.2 A
2. What happens to the voltage if resistance is increased in a circuit?
_________________________
3. What happens to the voltage if resistance is decreased in a circuit?
_________________________
4. What happens to the current if resistance is decreased in a circuit?
_________________________
5. What happens to the voltage if current is decreased in a circuit?
_________________________
6. What happens to the voltage if resistance is decreased in a circuit?
_________________________
7. What happens to the resistance if current is decreased in a circuit?
_________________________
8. What happens to the resistance if voltage is decreased in a circuit?
_________________________
Complete the calculations. Be sure to write out the equation, and to include the units!
1) What current would flow through a resistor
of 20 ohms connected to a 12 V supply?
5) What supply voltage would be needed to
provide a current of 1.2 A through a 40 ohm
resistor?
2) What current would flow through a resistor
of 40 ohms connected to a 10 V supply?
6) A resistor allows a current of 0.6 A to flow
when connected to a 9.6 volt supply.
What current would flow if the same resistor
was connected to a 12.8 V supply?
3) A 100 ohm resistor is connected to a 20 V
supply. What current flows?
7) Calculate the voltage supply needed to
produce a current of 12A when used with a
48 ohm resistor
4) What value of resistor would be used to
permit a current of 0.2 A to flow using a 6V
supply?
8) Calculate the voltage across a 300 ohm
resistor when a current of 0.004 A flows
through it.
9) Find the size of resistor which would allow
limit the current to a value of 0.02 A when
connected to an 8 V supply.
12)
An 80 V potential difference is measured
across a light bulb that has a resistance of 16 Ω.
a) What is the current through this light bulb?
10) Calculate the current which will flow when
(b) If the light bulb was replaced by a bulb with
twice the resistance, what would be the new current
through the bulb?
a total resistance of 500 ohms is placed in a
circuit which has a 15 volt supply.
11) A current through a resistor in a circuit is
1.5 A. If the potential difference across the
resistor is 6V, what is the resistance of the
resistor?
13) What is the resistance of a toaster if a current of
12.5 A flows through it when it is connected
to 120 V?
14) A flashlight bulb has a resistance of 4.0 Ω.
What current passes through the bulb if it is
connected to 3.0 V?
15) A light bulb has a resistance of 90 Ω. What
current flows through the bulb when it is connected
to 120 V?
========================================================================
Use the graph below to answer the questions that
follow.
1. (a) What happens to the voltage as the current
increases? ____________________________
(b) What does this suggest about the relationship
between voltage and current?
__________________________________________
2. According to the graph, what happens to the
voltage when the current is doubled?
___________________________________________
```