ELECTRICITY FOR TRADES (LOOSELEAF)
3rd Edition
ISBN: 9781260437454
Author: Petruzella
Publisher: MCG
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Textbook Question
Chapter 7.2, Problem 19RQ
A lamp dimmer switch is rated for 5 A at 120 V. What is the maximum wattage lamp that can be safely connected to the dimmer?
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Chapter 7 Solutions
ELECTRICITY FOR TRADES (LOOSELEAF)
Ch. 7.1 - What is the base unit and symbol used for...Ch. 7.1 - Write the metric prefix and symbol used to...Ch. 7.1 - Convert each of the following: a. 2,500 to...Ch. 7.2 - State Ohms law.Ch. 7.2 - List the three formulas associated with Ohms law.Ch. 7.2 - Calculate the unknown value for each circuit (a)...Ch. 7.2 - A pilot lamp with 12 volts applied to it draws a...Ch. 7.2 - A resistor has a resistance of 220 . The current...Ch. 7.2 - An electric soldering iron with a 40- heating...Ch. 7.2 - A baseboard heater draws a current of 8 A when...
Ch. 7.2 - A sensor module has an internal resistance of...Ch. 7.2 - The current through and the voltage drop across a...Ch. 7.2 - The heating element for an electric floor heating...Ch. 7.2 - How much power is lost in the form of heat when 25...Ch. 7.2 - The voltage drop across a 330- resistor is...Ch. 7.2 - A digital multimeter display indicates a reading...Ch. 7.2 - Calculate the unknown value for each circuit (a)...Ch. 7.2 - Assume that applying 120 volts to a resistive load...Ch. 7.2 - The voltage drop across a 10-W, 330- resistor is...Ch. 7.2 - The cold resistance of a tungsten lamp filament is...Ch. 7.2 - An electric baseboard heater is rated for 1200 W...Ch. 7.2 - A lamp dimmer switch is rated for 5 A at 120 V....Ch. 7.2 - A 400-W 4- public address speaker is to be fused...
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- Draw a circuit diagram. Draw two ways to connect the bulb, battery, and wire so that the bulb does not light.arrow_forwardDiagram of the problem, necessary formulas, clearance and numerical solution. A certain bulb has a resistance of 240 Ω when it is turned on. How much current will flow through the bulb when it is connected to 120 V, its normal operating voltage?arrow_forwardA 5 Kw v heater and 1 kW of lights are to be located 400ft from a 120 volt distribution panel and will be fed from a single cable. If the maximum allowable voltage drop is 5% what is the smallest size copper conductor that can be used in the cablearrow_forward
- What value shunt resistor is required to extend the range of a 10mA meter movement to 2.5A if the meter's coil resistance is 75 Ohms?arrow_forwardIf a 100W solar panel with solar charge controller is connected across a deep cycle battery and the battery must be rated 12V, what is the required Ampere-hour if the power total consumption is 724.8WH/day?arrow_forwardWhat is the power rating of the device which uses a 9-V battery and has a resistance of 180 ohms?arrow_forward
- A light bulb is rated for 120 volts and 60 watts (it means that the light bulb dissipates 60 watts if it is connected to 120 volt source). If we connect two of them in series and power them up with 120 volts source as shown below. How much power is dissipated by each light bulb?arrow_forwardHow to connect this circuit on the breadboard and how can the measurements be done please? :)arrow_forwardWhat is the voltage drop in a circuit that has a 50 load connected to a 120 V voltage source and contains a total of 20 No. 20 AWG solid copper wire?arrow_forward
- Explain why you think an ammeter can be connected in the circuit and not affect the flow of current. Explain why the voltage measured across the resistor is the same as the applied voltage.arrow_forwardA string of 30 mini LED lights, each using a 60 ohm resistor, are connected in parallel to a 3V battery. How much current is required by the whole string?arrow_forwardWhat is the total current in this circuit? Using the circuit in the question state what fuse value you would use and why. Using the circuit in the question if a person were to touch the casing of the device shown in that circuit, would they be safe under all conditions and why? Assume that shorts or open circuits are the primary conditions to consider in this situation.arrow_forward
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