Day 1 Ohms Law Series Lecture

Question 1

Relationship between force, flow, and opposition in an electrical circuit.

State’s “ the current that flows in a circuit is directly proportional to the voltage (force) that causes it, and inversely proportional to the resistance (opposition) in the circuit is know as

Answer 1

Ohms Law

Question 2

Horsepower is measure in

Answer 2

1 HP = 746 watts of electrical energy

Question 3

Calculate the amount of current(amps) needed to raise 1000lbs, 6 feet in 30 seconds.
Given: Hoist uses 24 volts, the force is 1000lbs, distance is 6 feet in 30 seconds.

Answer 3

Step 1 Calculate HP

HP= (force)x(distance)

(550)x(time in seconds)

HP = (1000lbs)x(6ft)/(550)x(30sec)

HP = .364

Step 2

HP into Watts

1 HP = 746watts

.364HP x 746watts=

271.5 watts

Step 3

Calculate amps required

I= P/E

I= 271.5w/24v

I= 11.31 amps

Question 4

No motor is 100% efficient

Calculate watts required for a 90% efficient motor to produce an output of 2HP.

Answer 4

2 HP x watts / 90%

HP = 746,

1492/.90

1657.8 watts is required.

Question 5

A circuit consists of:A Source of ______ energy

A ______, or energy consuming device

_________ to complete the electrical path

Answer 5

answer;
Electrical

answer;
Load

answer;
Conductors

Question 6

Two ways to complete the electrical path

1. _________circuit

When a wire is used to complete the path from the load back to the source

2. _________ circuit (grounded)

When a conductive structure (airframe) is used to complete the path for electrons back to the source.

Saves weight

Answer 6

answer;
Closed Loop

answer;
Single wire

Question 7

SERIES CIRCUIT

Algebraic sum of the applied voltage and the voltage drop around any closed circuit is equal to zero.

In other words the voltage dropped across the loads of the circuit must be equal to the source.

ET = E1 + E2 + E3

Voltage adds up

Answer 7

Gustav Robert Kirchhoff’s voltage law

Question 8

SERIES CIRCUIT

1. Algebraic sum of the current at any junction of the conductor in a circuit is zero.

2.The amount of current flowing away from a point in a circuit is equal to the amount flowing to that point.

3. Current remains constant

Answer 8

Kirchhoff’s current law