Yes, it can be activated during your opponents battle phase.
It's a Quickplay Spell card, so can be activated in your battle phase.
It says on the card that it is used during the opponent's battle phase. Yes, it can be used in the same battle phase it is summoned in, there is no restriction against this.
You can activate Windstorm of Etaqua during the battle phase in Yu-Gi-Oh. The card, Windstorm of Etaqua can not be activated during the damage step or after using a monster to attack your opponent in the battle phase.
The +200 ATK bonus is applied only 'during your battle phase', this is a continuous effect that does not use the chain. As soon as the battle phase ends, the +200ATK ceases to apply, but will be reapplied during your next battle phase. So say you have a monster with 1700 attack, it will ONLY have 1900 (+200) attack when you're in your battle phase and when you're back in your main phase 2 or end phase it goes back down to 1700 (-200). One thing to note is that you'll get the +200 attack during BOTH your own battle phase AND ALSO your opponent's battle phase.
Electric Virus's effect, like that of Dark Grepher and Puppet Plant, is an Ignition effect. Therefore, it can only be activated during your turn, during Main Phase 1 or Main Phase 2.
It's a Quickplay Spell card, so can be activated in your battle phase.
It says on the card that it is used during the opponent's battle phase. Yes, it can be used in the same battle phase it is summoned in, there is no restriction against this.
You can activate Windstorm of Etaqua during the battle phase in Yu-Gi-Oh. The card, Windstorm of Etaqua can not be activated during the damage step or after using a monster to attack your opponent in the battle phase.
Yes, of course. Quickplay spells can be activated at most times during the battle phase and up to the end phase, the spell speed 1 ones can be activated in Main Phase 2.
Yes, because it is a quickplay and can be activated during the battle phase.
Response
response
The +200 ATK bonus is applied only 'during your battle phase', this is a continuous effect that does not use the chain. As soon as the battle phase ends, the +200ATK ceases to apply, but will be reapplied during your next battle phase. So say you have a monster with 1700 attack, it will ONLY have 1900 (+200) attack when you're in your battle phase and when you're back in your main phase 2 or end phase it goes back down to 1700 (-200). One thing to note is that you'll get the +200 attack during BOTH your own battle phase AND ALSO your opponent's battle phase.
during the battle phase
When monsters attack during the Battle Phase, there are actually multiple "steps" that take place. When a player declares an attack, you enter the "Battle Step". If no card effects are activated that would stop the attack, you enter the "Damage Step" in which face-down monsters are flipped face-up and you actually calculate how much damage is done. It's at this point that a card that reads "during damage calculation only" can be activated or takes effect. For more information on how card effects can work and activate during the Battle Phase, refer to the Related Links section below.
No, an activated complex is not stable. It exists during the transition phase of the reaction, and its existence is ephemeral. It either reverts to the reactants or converts to the products.
Monsters can only 'manually' change battle position in your main phases. If you want to change them during the battle phase, you will have to do it by a card effect.